The Steam release is scheduled to be updated from Skyrim SE 1.5.97 + Enderal SE 2.0.12.4 to Skyrim SE 1.7.104 + Enderal SE 2.1.4.4 to bring it up to date with the base mod https://mod.pub/enderal-se/38-enderal-se
Enderal SE changelogs https://mod.pub/enderal-se/38/changelogs
The last version published here was released in 2023, and since then Enderal SE received an update from 2.0 to 2.1 which requires starting a NEW GAME. In addition to this, Enderal SE now uses a new savegame directory `Documents\\My Games\\Skyrim Special Edition\\EnderalSaves` to fix crashing on save in some locations.
The update is scheduled for the middle of October.
To continue playing an ongoing save, switch to the 'enderal_2.0.12.4' branch via Game properties -> Game Versions & Betas https://dl.mod.pub/enderal-branch-steam.png
In the same window, you can switch to the 'enderal_2.1.4' branch, which is going to be promoted to the main branch.
Saves made in 2.0 normally cannot be loaded in 2.1, but I noticed that some unidentified combination of mods allows to do so by reverting some changes - this DOES NOT mean it's fine, the save will still be broken. The launcher will warn about found 2.0 saves once.
Discussion topic: https://steamcommunity.com/app/976620/discussions/0/582809103434459399/