Hi,
we have not managed to get internet gaming working with the "old" DVD version on Colo anymore (have this in the past .. 5-6 years ago ..)
Not with VPN or other "hacks" ...
The only (and flawles working) solution is to buy the game "again" on Steam - here multiplayer work nice (sell for ~2€ on key reseller .. no problems with this)
Regards