This is a common problem when updating the game via the in-game updater. I'm not sure what causes it yet. Please try these steps:
1. Restart your computer.
2. Uninstall Cosmoteer. (It will *not* erase your save files.)
3. Re-install Cosmoteer.
Thank You Walt Destler The Game Works For Me Now.
Now I Just Got To Remember That I Cant Install New Updates In The Game