I said that you can do that, not that it would be a good idea 
It crashes now:D Guess I have to replay everything.
No harm done, either way you'd have had to restart.
Thanks. Previous version of BP worked perfectly without any additional builds.
The new version is built for forward compatibility with War in Heaven. Inferno builds (which will soon be standard builds, so this won't be a problem any more) allow us to use many more ships.
It's sort of annoying because the Installer doesn't require people to actually go to the release thread and read the install instructions. *sigh*