It's been condensed into the fps option in sega pc reloaded, basically in the original game, if you set the 60 fps option without motion smoothing, you actually get 30 fps. Spcreloaded lists the actual fps you get and ditches the motion smoothing option entirely. If you set 60 fps in spcreloaded it should be equivalent to 60fps+motion smoothing in the original. Never really checked if it actually works though!
Yeah, I've definitely got 60fps enabled, but I still have to enable smoothing every time. Eh, if it leads to more testing, then I'm glad I could help.
I'm curious, why is the download locked behind a request? Been wanting to mess around with Sonic and Knuckles Collection.
It's something Google implemented on Drive links a few years back - I've had a few uploaded files that were fine suddenly need to have the feature removed. I'm guessing OP just hasn't gotten around to, or doesn't use that account anymore.