If addon not working properly, try to remove similar SMG addons and avoid conflicts.

If addon not down/loading properly:
Delete folder "1102363334" in "Steam\steamapps\workshop\content\4000"
and then resub, Restart gmod after installation.
Also you can clear gmod folders like "cache", "download" in "GarrysMod\garrysmod"

To find conflicting addon you can:
Off addons temporary by pressing Disable All and turn on only SMG Remake.
Turn on addons one by one and restart the game after each addon or page of addons, after every page re-enter gmod until an error appears and you will see what exacly causing the error.