This is a very important thing because some people dont really know how to redownload a mod. Mod updates may cause your previous mod to perform abnormally, the best way to fix this is to redownload the mod as this is not something the modder can fix. They cant fix what is not broken, basically.

1. Remove the mod by pressing Unsubscribe

2. Remove the folder in you Steam/Steamapp/WorkShop/304930/ [mod folder]
(OPTIONAL: (Better to do it)

[mod folder] can be found from the page url . The number at the end is the folder name
My mod: http://steamcommunity.com/sharedfiles/filedetails/discussions/768349793
Hence 768349793 is the mod folder for this mod.

3. ENSURE that Unturned game/server is not open. You should never perform mod addition to the game/server when is on because it might corrupt the mod folder which will cause it to function abnormally

4. With the game and server closed, press the subscribe button again, to Subscribe. This time it should work normally.

That's all folks

I dont know if this will fix all the problem including the purple/ missing texture but it is worth a try. Tell me the result for those who see the purple/missing texture