WotLK I keep having crashes and error messages

[Vanderloh]

Hello I keep having crashes in Dalaran or just leaving Dalaran, it is impossible for me to stay in Dalaran I would like to know what the problem is, I downloaded the client elsewhere and not the one from the site web because I didn't want to download bittorent for security reasons, insufficient source memory I don't know what to do please help me !! ty

[Mitzen]

Large Address Aware could help.

[Vanderloh]

ty i will see that