This appears to be an issue with all of the product installers for the 2.2 GA products due to an expired certificate on one of the .msi files in the installer.
Development is currently working on a fix and will refresh the product downloads with an updated version of 2.2 GA when available..
The same problem does not exist with the 2.2 update 1 products only the 2.2 GA version.
Unfortunately the Personal Edition product has not yet been updated to the 2.2 update 1 level so that is not an option for that particular product.
If you have access to the full product release then you should download the 2.2 update 1 product and that should solve the problem.
I will update this post when the fix for 2.2 GA and Personal Edition becomes available.
Thanks.