I'm looking for a link to DL the older version so I can run many of the mods that were updated to it, but haven't yet been updated to A12D and thus are incompatible, which is proving somewhat frustrating.
Unless you retained a copy of the older version, don't expect to find a download link.
Just wait a few days and they should all be updated to 12D. c:
Tynan's supposedly going on a grand holiday once it's stable, so the mod authors will have plenty of time to catch up.
based upon the tiny change from 12c to 12d and the size of change from 12 to 12b/c I would sort of expect the mods to work, but the ones most likely to not are the ones with assemblies (dlls)
Just try your mods, everything should work fine (except for major dll mods), there were hardly any mod breaking changes in the hotfixes.