Have seen this twice now, but no mention of it in their support pages. Thought I'd document it in case anyone else runs into it.

If you install Adobe Reader 9 (without the googlebar) from the Adobe website, it will use getPlus (presumably an ActiveX install routine), but will error with this:

Operating System error! (15219.101.220)

If you get this error, just click the Okay button, then use the link on the Adobe page to download it instead (I've included it below).

Thank you. Your download will start automatically.
If it does not start, click here to download.

TEk