Hi Pedro,
There was a problem with an earlier release of the 2.2 base products in that the certificates for these installers had expired. We fixed this earlier this year by refreshing the installers for 2.2 that are on on Product Updates page with new ones.
I would recommend that you download the installer again and give it a try with the new version.
Also this problem only occurred with the 2.2 base release and did not occur with 2.2 update 1 which is the latest release so as an alternative you might want to download and install 2.2 update 1 instead.
Thanks.