If you have a spare drive around, you could try installing Linux on that. OR, you could create a virtual machine inside Windows 10 and install it there. That's giving that your main drive has enough free space for it. Or just stay on Windows 10 and take stronger security measures. You have some option here. But honestly. Just because Windows 10 will be going EOL in a couple of months isn't the end of the road. The OS will still run just fine. Most games and software will still be supported for a few more years at least. Hardware drivers on the other hand, well that's another story.