Install it alongside the previous version of Windows, in a different partition on the same disk or on a different physical disk. Ensure you choose the “Custom Install” option, not the “Upgrade” option. Install the Second Version of Windows: Next, you’ll install the second version of Windows.You could also insert a second hard drive into your computer (if it’s a desktop computer) and install the second version of Windows to that hard drive. If you have Windows installed, you can resize the partition. Make Room For the Second Version of Windows: You’ll need available hard drive space for the next version of Windows.You may want to use custom partitioning settings and leave free space available on your hard drive for the second version of Windows. Install the First Version of Windows: If you already have a single Windows system installed on your computer, that’s fine.The process for creating a dual-boot system is similar no matter what operating system you’re dual-booting with.

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