Created from the combined CCRL that I have on this site. That means the engine ratings are from that list — though it was designed to adhere closely to the actual CCRL. One feature of that list is that all the extraneous information is removed from the engine names. Meaning if an engine is listed as, say, “Stockfish 15 avx2 4CPU” or something like that, it was first changed to “Stockfish 15” before the rating list was made. As a consequence, all the engine names here are also just the plain engine name and the version number/name. So you’d have to make those changes first to whatever PGN you were adding ratings to.
Just load this into Scid via Options — Resources…, or into Scid vs. PC via Options — Load Spellcheck File. It then works like a normal SSP ratings file.
https://www.mediafire.com/file_premium/8e42fx5tqor44c9/engines.ssp/file