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Hmm, do you have enough space in your hard drive? That can be the case too. If that didn't work, come to our forums and create a topic about it.

Did you try again? If you did, probably a problem has occurred during the download. Redownloading the installer would help. But I suggest you to wait for a little longer because the new Alpha is on its way :)

Try random maps. In those, you can select your civilization/team/etc. :)

one is a ww2 fighter plane :)

Yes, and yes. :)

There is a planned expansion, 0 A.D. part 2 which will add the years 0-500 A.D. to the game. We "may" add some new civs as other official expansions or mods though.

Currently there are 2 modes. First is the mode you mentioned with the difference that enemy units can also move through it if it is open and second is a mode where the gate doesn't open at all to prevent your units from opening the gate and getting the enemy through. The whole system is like Age of Empires 2.

You are very close...

Yes there is. Although there is no multiplayer lobby. You must have the host's IP.