Loading up classic Diablo in the modes. I pick multiplayer and it says it needs the patch (even though it already has version 1.09 installed) it runs the patch, click ok, then it crashes every time.

Please contact GOG support. There is nothing we can do for you with the information provided.

Thanks, I will. I fixed one problem by running as administrator. That was the Diablo at the top. The classic just continues to run the Blizzard patch updater for a patch that I already have, runs it then crashes. I'll see what they can do.

What's the name of the gateway you see at the bottom left of the screen before you click "Battle.net"?