FM 8.0.4 patch for 8.0.2 versions released

I can't get the Windows FM 5.0.4 update to install.
My initial installation was 8.0.0, standalone version, and I've since installed the 8.01 and 8.02 updates in order, so I'm currently running using FM 8.0.2. My Help > About FrameMaker menu option confirms that my version is Version 8.0p273. When trying to install 8.0.4 it downloads the files and then gives me an error message:

"You do not have correct version of FM install on your system. This patch installer will work only with Version 8 p273 build. Patch installer will quit now."

Followed by another message:
"Adobe FrameMaker 8.0.4 Update failed to install."

I cant uninstall the updates either (with a view to re-installing them). When I try to remove 8.0.2 (8.0 p273) I get the same error message. I can't go forward, can't go back.

I am using FrameMaker 8.0p277 and Illustrator CS3 13.0.2. When I bring an Illustrator file which has a Symbol minus (-)sign in it into FrameMaker, and I make a PDF file of the FrameMaker document and view it in Acrobat, it shows up as u (mu). If I make a PDF of the illustrator file directly in Illustrator and view it in Acrobat, it is correct.

I save the file in Illustrator as CS3, Create PDF Compatible File, Embed ICC Profiles, and Use Compression.

I am at a loss and have a critical deadline.

Thanks for your help.

Glen Ballou