Here's a list of a few errors you may run into, and how to get around them!
Problem: "Unable to identify version"
Fix: Right-click your Annihilus Launcher.exe / shortcut and click Run as Administrator.
Problem: Cannot run in Full Screen, getting the Full Screen Mode error
Fix: This happens because some of our new features we offer cause crashes / issues in Full Screen, unless you change your Diablo II to use the new Glide setting we included in the installer. Run the Video Test on D2VidTst.exe (in your Diablo II folder) and select the option that says "3dfx Glide". After doing that you can customize your settings even further by opening glide-init.exe in your Diablo II folder, although I would not change much unless you know what you're doing! Or you can just run Diablo II in windowed mode instead.
Problem: "UNHANDLED EXCEPTION"
Fix: Always restart your computer first for this issue, it will fix it 90% of the time. Be sure you go to "Restart" and not "Shut Down", as shutting down will not work.
If the problem still persists then the issue is with DEP. You can disable DEP by opening Command Prompt as administrator and running this command: "bcdedit /set {current} nx AlwaysOff". You will have to restart the computer once more for this to take effect.
Problem: "Cannot load D2Ex2.dll!"
Fix: Download and install the VS 2013 and 2015 x86 Redists found here and here.