I've created a fork of Tenebris under the name "Tenebris Prime." While it might be premature now, if the original Tenebris goes without any updates for an amount of time you can decide, you might want to replace Tenebris with my fork, which has several QOL upgrades, and will likely receive pull requests to further improve it.

Good to know; if the original author is confirmed to be MIA, I'll be sure to replace it in the pack with a note explaining why. Best of luck on the fork!

Officially replaced Tenebris with Tenebris Prime as of v1.0.9

What about backwards compatibility ? I've already gone through the regular Tenebris. But now I had to disable Enable All Planet Mods because it now conflicts Tenebris and Tenebris Prime.
If I delete Tenebris and turn back on Enable All Planet Mods with Tenebris Prime all my base built on Tenebris will be saved ?

As far as I could tell, Tenebris Prime retains the internal names of all technologies and everything from the original mod, so if you replace the first Tenebris with Prime and then load up your save, it should still work properly

Yes, everything started up fine. It's safe to switch :) thanks!

Also, I've integrated all of the Tenebris expansion mods I've found into Tenebris Prime, so you can delete those QOL mods without issue.