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Getting MoSh working on FoundryVTT v14
In this post, I describe how I got the unofficial MoSh Mothership module for FoundryVTT working on v14, despite it not being updated.
I wanted to run a couple of oneshots of Mothership using FoundryVTT, but unfortunately ran into some trouble after updating FoundryVTT to v14. You see, Mothership has its own dedicated app/VTT called Mothership Companion, so there’s no official FoundryVTT package. Instead, somebody called futilrevenge made an unofficial version, which works quite well. However, as per this writing, that package does not work immediately; in fact, it hasn’t since the release of FoundryVTT v14 on September 26th 2025.
Fortunately, when I looked at the issues on the GitHub repository for MoSh, I saw that somebody had already flagged this as a needed fix. On top of that, three weeks ago, a user named ailstyn posted a solution: the system.json file just needs to be flagged as v14 compatible. That turned out to be ridiculously simple!
On my install, I put my FoundryVTT data under ~/.local/share/, though you may want to find out where it is on your install.
From there, the file I needed was in /FoundryVTT/Data/systems/mosh/, called “system.json”, as indicated by ailstyn.
Opening that up in an editor, I scrolled all the way to the bottom to find:
"compatibility": { "minimum": 13, "maximum": 13, "vefified": 13 }
All I needed to do was change the "maximum": 13 to "maximum": 14 and Bob’s your uncle.
I haven’t run a game with it yet, but everything does seem to work. I hope it’ll help you out as well.