In what has to be the first security fix in a very long time, downloading a patch instead should make things easier. As you can probably guess, 3.33 is now running on here.to patch up several currently-undisclosed flaws which were found internally by Six Apart themselves. Though you can download the whole shebang again, in reality the changes only seem to affect a few files and therefore
Note that the vulnerabilities also affect Movable Type 3.2, and possibly even older versions if they’re still being used. Remember that as with the 2.6x series, the personal edition MT 3.3x has no limits on how many authors or blogs you can have, so there’s little reason not to upgrade.