Ted,
On this one, I would suggest getting in touch with your local support people.
Although, there are a few things to consider. If you do not have too many projects and you have PLNs from which you can re-share, it might just be easier to re-install.
A trick that might get the installer to run, is to look for the ProductVersion.xml for the AC 13 module of the BIM Server. This would be under Server Modules/1300/TeamworkServer. Open that with an editor that properly handles xml files (avoid things like word or pages... -- If you know how to use vi, then use vi). Change the tag for the build number to a number one less than what is written. For instance, you have 3832 as a build number for the product version, change it to 3831. Then try the hotfix again.
Graphisoft Technical Support