The only other thing I can think of is to ask whether you were within the 32 bit or 64 bit version when you downloaded the installer - maybe that matters. If not, I'll flag this to support when I'm back at work on Monday, and maybe they've seen this sort of thing before and know what to do.
Question - how do you know you installed the pdfcanvas to c:\Program Files? I just tested the process, and the installer for the pdf plug in never mentions a file location as it's running - it just runs without needing to ask questions beyond confirming that it's allowed to run. Also, why uninstall HL before updating?
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