Hey there!
Did you try that button "Verify and fix installed Game client files" yet?
Also what I found when I was looking for a solution is this -> Try installing visual c++ redist. from MGLauncher\Allods Online EN (EN)\VC_redist and install directx 9 in case you have new windows install.
I hope that any of this will work out already otherwise maybe you´ll have to install the game again maybe.
Let me know if you solved it or if you still have issues!
Greetings