#30 - June 15, 2011, 3:12 p.m.
Hello,
If you have deleted some of the essential game files the game may ask you to redownload them or completely reinstall the client, depending on what sort of files have been deleted.
I would suggest that you download the 2GB data that the game is asking you to and see if you experience any issues after that.
cant stand that i need to download stuff everytime i get a new addon / delete a new addon or delete the creaturecache.
I'd like to point out that addons not made by Blizzard Entertainment (all addons that you download manually from unofficial websites) are not supported by us and that you are using them at your own risk. If you are experiencing issues when using 3rd party addons I suggest that you refrain from using them and the game should work without issues.