Did you have any success figuring this out? I get the exact same error. I tried copying all the DLL files from the older version but it still doesn't work. So it's either in gmlive-server.exe or gmlive-server.n but I have no idea what to do with them. Running Win 7 64-bit here, GMS2 is all up to date and the older version of GMLive works no problem
EDIT: ok nevermind, this fixed it: https://itch.io/post/1096119 if you have this problem just download that neko.zip file and copy the DLLs to your gmlive directory and it works! :)