Microsoft has rolled out a free evaluation version of Windows 10 Enterprise edition so you can play with it for 90 days if you're still on the fence about upgrading.

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On Wednesday, Microsoft officially started pushing out Windows 10 as a free upgrade to Windows 7 and 8.1 users who reserved a copy. The upgrade is free for one year, so if you haven't yet installed it, you have plenty of time to decide whether or not to dive in. The upgrade naturally wipes out your existing installation of Windows 7 or 8.1, though you can roll back if for whatever reason you don't want to stick with Windows 10.

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Another option, though, is to install the free 90-day trial of Windows 10 Enterprise edition to check out the new OS.

But if the Windows 10 upgrade itself is free, why would you need to bother with a free evaluation edition? Well, installing the trial version gives you three months to check out Windows 10. During that time, you can still maintain your current Windows 7 or 8.1 environment for your everyday tasks. The Windows 10 Enterprise edition is geared for large businesses, but it still offers the same features you'll find in the Windows 10 Home and Windows 10 Pro editions as long as you pick the right option when you download the software.

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So, how would you install the Windows 10 Enterprise trial edition and still maintain your existing Windows 7 or 8.1 environment if you're so inclined? Here, you have three options.

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1) If you have a spare or test PC that's lying around not doing anything, you can install the Enterprise edition cleanly on that PC and use that to check out Windows 10.

2) If you have a PC with enough disk space, you can create a dual-boot setup. A dual-boot setup allows you to run more than one operating system on the same PC by storing them in separate partitions. When you turn on your PC, a boot menu appears, allowing you decide whether you want to launch Windows 10 or Windows 7 or 8.1. This CNET how-to article explains how to set up a dual-boot environment for Windows 7 and 8, but the process would be the same for Windows 10 and Windows 7 or 8.1. And this article from Microsoft specifically explains how to dual-boot Windows 10 with another version of Windows.

3) As as for that third option, you can set up a free virtual machine program in Windows 7 or 8.1. A virtual machine program lets you install and run Windows 10 in its own environment within Windows 7 or 8.1. There are two free virtual machine programs that you can download and install to create your VM environment. One is called VirtualBox and is made by Oracle; the other is VMware Player made by VMware. This article by CNET's Rick Broida explains how to set up a virtual machine using VirtualBox. This article by CNET's Tom McNamara covers similar ground. And this article by yours truly explains how to run Windows 8 in a virtual machine using either VirtualBox or VMware Player.

Instead of using the Windows 10 Technical Preview as explained in the above stories, you would use the new Windows 10 Enterprise 90-trial edition.

• To download the Windows 10 Enterprise 90-trial edition, go to Microsoft's TechNet Evaluation Center.
• Click the sign-in button to download Windows 10 Enterprise. Sign in with your Microsoft account credentials.
• Click the 'Register to continue' button to register for the Windows 10 Enterprise edition.
• As you complete the registration process, make sure you check the option for Windows 10 Enterprise and not Windows 10 Enterprise LTSB. The LTSB edition excludes most of the key Windows apps and the Windows store, while the regular Windows 10 Enterprise edition includes all of the core apps and other content.
• You then have to choose whether to download the 32-bit version or the 64-bit version. Unless you're using a very old computer, choose the 64-bit version.
• You then choose your language.
• You're then prompted to download the installation file, which is formatted as an ISO file you can copy to a USB drive or burn onto a DVD. Make sure the option to Save File is selected and then click OK.
• After the file has downloaded, you'll need a software program to copy the ISO file to a USB stick or to burn it onto a DVD. A good program for this is the free Windows USB/DVD Download Tool. Download and install this program.
• As you run the program, you can then decide whether you want to copy the ISO file to a USB stick or burn it to a DVD. After you've completed the process, you can use the USB stick or DVD to install the Windows 10 Enterprise edition.

The basic installation steps are the same as outlined in the CNET articles mentioned previously. However, there is one step in installing the Windows 10 Enterprise edition that may be confusing.

At one point, the Enterprise edition asks if you want to join an Azure AD or join a domain. Unless you're actually using the Enterprise edition in a large organization, neither of those options would apply or make sense. You do have to choose one or the other, however, to get past this screen. Choose either option.

You're then asked to create a local account for Windows 10. Create a username and password, and Windows 10 will finally load. What if you want to use a Microsoft account for your Windows 10 trial version, so that you can sync it with the settings and options on your Windows 8.1 computer? No problem.

• Click the Start button and then click on Settings. At the Settings screen, click the category for Accounts.
• At the Accounts screen, make sure that the 'Your account' setting is selected.
• On the right pane, click the option to Sign in with a Microsoft account instead.
• Type the username and password for your Microsoft account.
• At the next screen, decide if you want to create a PIN for logging in.
• At the 'Your account' screen, click the link to Verify your identity on this PC.
• You'll receive a code on your mobile phone that you'll use to verify your identity.

Yes, you can upgrade to Windows 10 for free from Windows 7 or 8.1? But how do you know you'll like Windows 10 unless you try it beforehand. The Windows 10 Enterprise evaluation edition gives you that opportunity. Plus, it's free to try. And running it in a dual-boot or virtual machine setup means you don't have to wipe out your Windows 7 or 8.1 environment.

Update, 8/4, 9:30 a.m. PT: Adds details on how to download the regular Windows 10 Enterprise evaluation edition, which gives you access to all the core Windows apps and the Windows Store.

Microsoft allows anyone to download Windows 10 for free and install it without a product key. It’ll keep working for the foreseeable future, with only a few small cosmetic restrictions. And you can even pay to upgrade to a licensed copy of Windows 10 after you install it.

Whether you want to install Windows 10 in Boot Camp, put it on an old computer that isn’t eligible for a free upgrade, or create one or more virtual machines, you don’t actually need to pay a cent.

How to Download Windows 10 and Install it Without a Key

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First, you’ll need to download Windows 10. You can download it directly from Microsoft, and you don’t even need a product key to download a copy.

There’s a Windows 10 download tool that runs on Windows systems, which will help you create a USB drive to install Windows 10. If you aren’t on Windows, you can visit the Windows 10 ISO download page to download an ISO directly (say, if you’re installing Windows 10 in Boot Camp on a Mac). If you visit that page on a Windows machine, it’ll redirect you to the download tool page instead.

Just begin the installation process and install Windows 10 like you normally would. One of the first screens you’ll see will ask you to enter your product key so you can “Activate Windows.” However, you can just click the “I don’t have a product key” link at the bottom of the window and Windows will allow you to continue the installation process. You may be asked to enter a product key later in the process, too–if you are, just look for a similar small link to skip that screen.

If you don’t see this option, you can also provide a KMS client setup key to continue. These keys won’t give you an activated copy of Windows unless you’re in an organization with a Key Management Service, but they will allow you to get through the Windows installation process.

When you select this option, you’ll be able to install either “Windows 10 Home” or “Windows 10 Pro.” Bear in mind that, if you plan to pay to upgrade to the paid version later, it’ll be cheaper to upgrade to Windows 10 Home, so you may want to install the Home version. Whatever version you choose, Windows 10 will install normally.

The Cosmetic Limitations

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After you’ve installed Windows 10 without a key, it won’t actually be activated. However, an unactivated version of Windows 10 doesn’t have many restrictions. With Windows XP, Microsoft actually used Windows Genuine Advantage (WGA) to disable access to your computer. These days, Windows just complains at you in a few minor, cosmetic ways.

Initially, you won’t notice a difference. Eventually, Windows will start nagging you a tiny bit. First, you’ll notice a watermark in the bottom-right corner of your screen. You’ll also see a “Windows isn’t activated. Activate Windows now.” link at the bottom of the Settings app. This is the only form of nag you’ll see–there are no pop-up windows, for example.

Second, you’ll be unable to change your desktop wallpaper and from the Personalization > Background screen in the Settings app. You’ll see a “You need to activate Windows before you can personalize your PC” message at the top of this window, and the options for changing your wallpaper will be grayed out.

You can still change your wallpaper in other ways, however. For example, you can right-click an image in File Explorer and select “Set as desktop background.” You could also open an image in the Photos app, click the menu button, click “Set as,” and click “Set as background.” Windows 7 eventually switched you back to a black background, but Windows 10 doesn’t seem to do this.

You’ll find Windows 10’s included wallpapers under the C:WindowsWeb folder in File Explorer.

Aside from these basic limitations, your Windows 10 system will continue to work forever. There are no nag prompts aside from the watermark, you’ll get all the system updates, and everything else is completely functional. The only thing that could change this is a Windows 10 update, but Microsoft has become increasingly lenient since Windows 7.

How to Upgrade Windows 10 to an Activated Version

With Windows 10, you can now pay to upgrade a “non-genuine” copy of Windows to a licensed one. Open the Settings app and head to Update & Security > Activation. You’ll see a “Go to Store” button that will take you to the Windows Store if Windows isn’t licensed.

In the Store, you can purchase an official Windows license that will activate your PC. The Home version of Windows 10 costs $120, while the Pro version costs $200. This is a digital purchase, and it will immediately cause your current Windows installation to become activated. You don’t need to purchase a physical license.

We installed Windows 10 Professional as an example here, so the Windows Store will only let us purchase the $200 Windows 10 Pro license.

This option may not be available in all countries. The prices here are for the US version of the Windows Store. Microsoft charges different prices in different countries and currencies.

Windows 7, 8, and 8.1 worked about the same way. Microsoft just didn’t officially allow you to download Windows without a product key, and there was no way to fully upgrade to a licensed system from within Windows. That makes this all the more tempting with Windows 10–for example, you can install Windows 10 in Boot Camp on your Mac for free and, if you find yourself using it frequently, you can quickly pay to remove the watermark if that’s worth it for you. It’s like a free demo, and you can use it to make all the virtual machines you like for testing purposes.

Sure, the license agreement may say you’re not supposed to use it without a key, but Microsoft’s license agreements say all sorts of confusing things. Microsoft’s license agreement still forbids using the popular “OEM” copies of Windows 10 on PCs you build yourself. If Microsoft doesn’t want people using unactivated copies of Windows 10 for extended periods of time, it can release a system update that disables this.

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