Currently, ArcEmu is not very stable as the databases currently supporting it are not great. If you still wish to play a "stable" ArcEmu server, I suggest you try compiling the core yourself, instead of relying on a repack. The details on how to do this are pretty straightforward, and are found here : Compiling: Windows - ArcEmu-wiki
If you want to find a more stable core, Trinitycore is the most stable in my opinion. You can again find a repack or you can compile your own core here : How-to:Win - TrinityCore Wiki
It is a little harder in my opinion, but is a much more stable server.