Some of them work. and few of them did not.
Ones that are broken, Zero's Fruit slicer machine wheels are broken, Zero's Lawnmower trailer wont connect, Zero's Pizza Maker is fully broken, Zero's Crackermachine is fully broken, and it's in French (You can change it to english in the settings) ; other then that the rest work fine.
Ps: I didn't try Zero's Meth or Genlab or retrominning being I paid for them on the Gstore, so they're untested in this pack.
And on a side note I didn't look for backdoors, there could be some of them too.
Garry's Mod Leaks