I an still using Sound Forge 7.0 on Windows 10 and it seems to work fine. Audacity is also a quick and dirty tool that is useful.
I am not sure the difficulty you are having lies with Sound Forge. Is it just having your audio applications request that your audio interface switch sampling rates?
I have an older interface and it sometimes gets stubborn when I switch an app to a higher sampling rate, and then open a different app with a different rate. I usually hear an audible click if the switch proceeded normally. If I don't hear anything, that could be bad and it can be time to reset, reboot, whatever.
So I generally try to keep my system working at a constant sample rate, instead of jumping around. If you just need to render a file at a different sample rate, it should not be an issue, unless you try to open it up and play it back.