Hi

A quick search on eBay and Aliexpress returns FD to EF adaptors that can be had for as little as $US12, including free shipping but the average is $US20. These do not support autofocus but adaptors that do are slightly more.

Example:

https://www.aliexpress.com/item/High-Quanlity-Lens-Adaper-Ring-for-CANON-FD-Lens-and-EOS-EF-Body-Mount-Adapter-450D/291099137.html

I have both a Canon 600D and a 60D using the Canon supplied software bundle.
It has been my experience that this software actually works faster and is more stable on Windows 10, than it was previously on both Windows 7 and later on Windows 8.1