After doing some digging around, I found the 2.0 build version 2 and now it works.

Hello!

So i'm new to source Multi-Tool, I wanted to use it for Gmod mapping since people said it was good for that. But sadly, i've tried two supplied links, and the copy I got from both failed me and refused to start up. Can I get any help with this?

It'll act like its loading, with the spinney wheel of death and all, but then after a few seconds it stops. Any ideas?