1) You can find the Last TDM Version (3.10), here:
Full Version:
http://forum.shrapnelgames.com/newup...1019503168.zip
Update from 3.0 to 3.10:
http://forum.shrapnelgames.com/newup...1019503699.zip
2) Think that Mephisto have included the fixes for all the knew problems.
3) Yea. You will find more competitive AIs. But... don't expect miracles.