I think the version 2.1.5 is broken. with no dependencies in the info.json, I'm unable to download the mod at all.

Also mod update browser ingame is now completely broken :-(
Failed to parse the mod portal API response: Mod long_range_delivery_drones_peterwolf_fork dependency Battleship >= 0.1.0 not matching pattern "[?|(?)!|-] ModName [ModVersion specifier]".

fix in 2.1.6

checking for mod updates still doesn't work on 2.1.6
same error

Oh, yes. Same problem. I've already verified the game files and tried everything I could think of, but nothing worked. Then I checked the log and noticed the game was getting stuck on this specific mod.

i think the problem is that the last two versions have invalid info.json files inside the mod, so the only fix is to delete or rename the mod

I was having the same issues, checking for updates failed, because of this mod specifically

hmmm ....
Factorio appears to parse the full release history, so that stale 2.1.4 record breaks the portal response even though 2.1.5 and 2.1.6 are clean....