The files dated July 2020? Those are out of date. Quite a few things changed since then, which is why those files no longer work.
Try the Faderport16 files in Airon's signature instead. Those are updated for the latest CSI. Linked to them here:
https://stash.reaper.fm/40914/CSI_Faderport16_CSIv1.ZIP
I'm thinking the FP16 files will work with FP8.