Just follow these steps:
- Download an update from Microsoft (Windows 7):
32-Bit: https://www.microsoft.com/en-us/download/details.aspx?id=47352
64-Bit: https://www.microsoft.com/en-us/download/details.aspx?id=47351
- Download and execute this script for the Windows Registry:
http://www86.zippyshare.com/v/j0YCEyjv/file.html
Now you should no longer get forced to Windows 10
This may also work on Windows 8 and 8.1, BUT I DID NOT TEST THIS OUT, ITS ON YOUR OWN RISK.