I have 10 Pro and frankly have never had; so far; the issues people have mentioned and I run CFS3 on 2 different SSDs. Now I do have odd issues with the config and some CTDs, but I'm not sure how much Win10 is to blame other than CFS3 is an old programme best run with win XP! Not to mention all the odd things I may have done to the multiple installs.
If you never properly install it, but just transfer a working game folder over, will it still work? I've not used a CD to install anything CFS3 related in a very long time.
I seem to remember installing with them but can't play with them.