Argh ...what am I doing?
Fresh install via Steam (backed up DLCs, but deleted everything else). Ran the new version with no patch = all good. Put in new .dll, and then run = no good. Tried the rollback method (old beta, using the code, with the correct upper and lower case, selected 'previous version', tried again = no good. Get to the white screen before the logo splash and it kicks me out and back to Steam.
Do I also need to roll back the .dll to the older version if I'm trying the beta workaround?
Edit - I got it working. Uninstall, reinstall, added .dll, ran ok. Added asio, ran ok. Then added rsmods, working. Amazing work to the mods and patchers. Many, many thanks!