The naming scheme for provided tarballs is different from the scheme you must follow (voir Delivery). Our naming scheme looks like 2004-tc-2.0.tar.bz2. If we update the tarballs, they will be named 2004-tc-2.x.tar.bz2. But your tarball must be named login-tc-2.tar.bz2, even if you send a second version of your project.
We also (try to) provide patches from one tarball to another. For
instance 2005-tc-1.0-2.0.diff.bz2 is the diff
erence
from 2005-tc-1.0.tar.bz2 to 2005-tc-2.0.tar.bz2.
You are encouraged to read this file as understanding a patch is
expected from any Unix programmer. Just run bzless
2005-tc-1.0-2.0.diff.bz2.
To apply the patch:
You might need to repeat the process to jump from a version x to x + 2 via version x + 1.