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If you are on Mnet and you host a game, you cannot join that game from your other computer because both are using the same IP.
The demo is using 1.5.1 and there is no need (at least not yet) to update it. Users running 1.5.1 can still play with 1.6 users. Those two versions can run in 1.5.1 mode as long as a 1.5.1 user is present. Older versions can't do this. To test your ability to host you would need to get online and see if someone joins your game. If they can join then you don't have a blocked port or firewall on.
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