Post your:
Server launch command line
Theater override line used in server.cfg

I resolved it, the theatre line that I was using in the cfg was incorrect for the mod.

I have the same problem:

Log says:

[CWorkshopItem] "The Armory: Expanded" - 8 & 12 Player Checkpoint & Conquer Custom Theater [667288497] installed!
[CServerUGCManager] Item 667288497 has been downloaded.

After that:

Theater file 'scripts/theaters/theater_35angrybots8p_default.theater' does not exist!


server command line is:
./srcds_linux -usercon -port 27015 -workshop +sv_lan 0 +sv_pure 0 +maxplayers 45 +map market_coop

server.cfg:
sv_playlist "custom"
mp_theater_override theater_35angrybots8p_default
mp_coop_lobbysize 8


I did not found a 'scripts' folder in my installation so i have no idea where it got downloaded to. How did you solve it?

Ok i found the issue. The Guide here https://www.thearmorymod.com/play-the-armory/host-multiplayer.html lists the wrong subscription id.

For the 35 Angry Bots Version its ID 859127166 and not 667288497.

Ill fix, thanks for pointing that out :)

How to play with 16 players?

There is 18 player theater with medics.

18? wow