You have a few options:
- You use the CDs themselves and install the patches manually (I’d also suggest blocking the game’s executable in your firewall so you can’t update it by accident if you go that route)
- You download the installers from this thread → Classic Warcraft III --- Official Installers - Official Patches ← and patch manually again.
- You find the installers from another website and patch manually, usually those sites have the patches somewhere in there as well.