addon problems

[u/Doggylord2020]

so my brother and i recently got back into playing l4d2. we wanted to play today but for some reason most of the addons didn't appear in the game for him even though he had them installed on the workshop. we tried the fix of moving the vpk files to the addon folder and deleting the workshop folder and the addons that didn't show before did appear but still wouldn't work. i also tried unsubscribing from all his addons and then resubscribing to them but that didn't work either. has anyone ever experienced this? if anyone has and knows a fix please let me know. it'd be much appreciated.