Hi, i have the Auctionator installed and used it before cataclysm, but now it doesn't appear in the ingame addon list anymore. even after deleting and reinstalling

Just update Auctionator_Wrath.toc add 40400 to ## Interface, save as Auctionator_Cata.toc and it should work. I also upped the ## version from 10.2.36 to 10.2.37 but i'm not sure that is necessary. I've briefly tested it and it seems to work now.

This issue is resolved by updating to the Cataclysm version of Auctionator. Available in your add-on manager (which will need updating) or from Curseforge/Wago