Not readible

hello there facepunch,as you may know i was the guy who didnt have any folders addons or garrysmod,but now i have them but i have a problem.
Everytime i download a file and put it where i want it i.e addons but it wont show up ingame i have things where i put it in,PROGRAM FILES and another file that made up so if this has happend to you can you help
thanks in return -R

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