Your GPU is too old
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If you would've taken the time to read the description, you would've known that the itch version is not the latest. And it's pay what you want, you don't need to donate anything at all - Itch shows a "no thank you, just take me to the downloads" link.
You can unlock the input framerate field by opening the Debug Tools, going to Config Editor, changing allowCustomInputRate to True, and then changing your framerate to 15 FPS in this case.
I plan to make an easier slowmo option in the future.
The comment was written 3 days ago when I still used an older host and SSL configuration, the latest download should work fine.
Generating extra frames for duplicates is planned.
Seamless loops are an option in Flowframes.
Download the linked one for now, it works as well.
Future updates will be distributed via an installer.
AVI, h264 (CRF 0) and h265 (CRF 0) are also lossless. ProRes is technically not lossless, but very close to it.
Join the Discord and send me the logs in #flowframes-support after reproducing the problem.
Taking the frames from the interp folder will not work with deduplication or scene detection. If you want to correctly encode it, check if there's a "frames-2x.ini" (or similar) file in the temp folder, and encode it using the concat demuxer in ffmpeg.