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Apple stopped supporting the Adobe PDF virtual printer a long time ago, so unless your computer also has a very old OS version, you're not going to be able to install it. You should also expect other issues with this old version of Acrobat if that's the case.
LJ Penner, I have been having the same issue. My Mac is running OS X El Capitan (10.11.6) and has the rest of CS5 installed and working properly. Have you been able to fix the problem?
(On a side note, the whole reason I need Adobe 9 Pro is to print a PDF from Word that includes the whole page. The default "save as PDF" method, through the "save as" or "print" menus cuts the file off at the margins. What was the other PDF printer you installed?)
Acrobat 9 is not compatible with your OS version. Problems are to be expected.
@try67 If the rest of CS5 works very well, shouldn't Acrobat 9? I was under the impression that the system requirement was a minimum requirement. Do you think a newer version of acrobat would still be compatible with my CS5?
@LJ Penner After reinstalling it, forcing a quit, and reopening it, it is now ready for a serial number (which I still need to get). Have you tried reopening the program after you force it to quit?