Anyway this mod doesn't fix unit upgrades besides fleet units, FotE doesn't provide land unit upgrades (besides few unique), so they can't block tech which doesn't exist.
Look eventually for mods' order if you really can't recruit some + some eastern units are actually subculture specific, like Armenian Spears are not available for Sassanids.

I should have specified: I'm only using Europa Perdita Reloaded + this mod

FotE doesn't provide any unit upgrades, (besides some unique) this mod cannot impact on features that don't exist.
Verify other mods you are using and select compatible only.

Hello, I noticed this mod disables all tech-related unit upgrades for the Sassanids. I can't upgrade or recruit any Armenian spears, Elite Immortals or Dailamites. -bug?

That list is not meaningless and was created to avoid unnecessary trash:
https://steamhost.cn/steamcommunity_com/workshop/filedetails/?id=1575489072

Nope, it was a compatibility issue with this one:
https://steamhost.cn/steamcommunity_com/sharedfiles/filedetails/?id=2807096193&searchtext=victory+conditions+mod

Restarted without it with WRE and Argentatorum has 4 slots. My bad.

They are actually fixed with FotE + EP Revised. If you play just FotE without EP/Revised you can use it anyway, unless author didn't sneak some unwanted changes that collide (what is unfortunately notorious manner).

@Aurelinus

https://steamhost.cn/steamcommunity_com/sharedfiles/filedetails/?id=2625696931

Since you made a submod of Athanasios' mod for FOTE+EP, maybe you could take a gander at this mod as well.

Wink-wink, nudge-nudge, if you know what I mean.

helloo, i want to start a new campaing after some time, this is the definitive list of latest mod (like DEI style)?

got it for the archer accuracy fix :3

So what does this mod actually do? Does it combine the mods, or..?

Great mod.

Where can I find the Loading screen mod?

Awesome!

Nice Touch :D