You can download and install the
WC2 Combat Edition from the server site, which will give you full online multiplayer functionality. It is a Windows program, but I believe it runs on IOS with the usual emulators etc.... IDK I'm not an Apple guy.
There is no reason why you can't have your BTDP1.0 installed for your single player campaign and use CE for multiplayer. This is pretty much what what BNE does anyway when you select single player/multiplayer from the main menu.
I am told CE now includes the single player campaigns also, although I have never personally tried this.
Finally there is a torrent of the original Warcraft II BNE CD install disk floating around in ISO format. There's not many seeds, but you might get a copy with some luck. Again this is windows only tho.
I believe the actual original CD had both PC and MAC install files on it, as well as Audio-CD in game music, although it seems I have lost my original CD long ago
Good luck!