Hmm looking at the history at the author's page it looks like 2.2 not 2.2a should be the hard one to get, as 2.2a was released one day after 2.2 and was most current version for a week. Archive.org has two snapshots of the page for the time 2.2a was the most current version with downloads available. I was however unable to find a version info in the file i downloaded.
Edit: Ah there it is.. well it sais 2.2, but considering the timestamp of the snapshot it might as well be 2.2a without an updated version number.