Weapon change.

Okay, I'll try something else later.

Well, if you follow the tutorial, which I think is here on the site, and download the files that forum members have saved, then all the programs will work - yes, it's very tedious, but it works... Read more carefully, and in general, if there's some kind of error there or something, you need to post screenshots so that it's clear

Added 2 minutes ago
P.S., it just doesn't start... that's strange

Added 1 minute ago
Well, as an option, Maya is only needed for importing into the game - if you prepared the file in Blender, 3ds Max, or somewhere else, make an FBX and post it here with a request to reformat it into a game file...