FYI, latest version of the game fixed this.

I have an idea of what might be the cause, i'll check today or tomorow

Launching from the .exe works because I have the loadorder.txt file which points to the folders that Steam downloads, so it's the same mods being loaded.

I was wrong though and it's not related to this mod, it's the Corals Customisation Compendium one, even if I only have it enabled the game does not load.

Anyway this is the error I see (shortened to fit)

KeyNotFoundException: The given key 'makeup' was not present in the dictionary.
at System.Collections.Generic.Dictionary`2[TKey,TValue].get_Item (TKey key)
at PCC+BodySet.Init
at PCCManager.Init
at Core.Init
at Core.StartCase
at Core.<StartCase>b__38_0
at ModManager+<RefreshMods>d__15.MoveNext

InvalidOperationException: Steamworks is not initialized.
at Steamworks.InteropHelp.TestIfAvailableClient
at Steamworks.SteamInput.Shutdown
at HeathenEngineering.SteamworksIntegration.API.Input+Client.Shutdown
at HeathenEngineering.SteamworksIntegration.API.App.Application_quitting

Using the .exe launches the game without any workshop mods. Its difficult to say what exactly is causing this without the error log. You can find it in appdata/locallow/lafrontier/elin. Its a file named player.log, it'll have something about an error somewhere. Though for debugging mods i'd recommend joining the official discord server, there is a channel for that there.

Seems like this mod has issues loading through steam, probably because of the dependency (only mod I have that has one). When I launch the game through Steam it's stuck on loading mod with a black screen, even if the load order is right.
If I launch through the .exe file on the game folder it's fine though (it opens the game twice for some reason but one of them closes with an error and then you can play normally).
Just a heads up.