1. Animations not working on soldiers - You either have conflicting animation addons, or you didn't download the required one.

2. Soldiers aren't leaving spawn - issue above, or you have addons that change NPCs or their AI.

3. Waves don't end/can't get uprades - Addons that change NPCs cause this. (e.g. HLR.)

4. Animations broken after installing the required addon - All of the above. Also make sure to restart your GMOD after downloading it.