Can't update Acrobat 8 Pro for Mac--unidentified developer error

I have 8.1.5.  Running Mac OS 10.9.1.  Downloaded the update to 8.3.1 and when I try to open the installer, I get the "unidentified developer" error message.
Do I have to go through the 20 or so serial updates or is there another solution?
Thanks.

Hi MacManInLou,
As per the tech specs of Acrobat 8.0 it compatibility was only tested with Mac Os 10.4.3.
This version of Acrobat was even tested with 10.6 or above but there are lots user still using on various version of Mac Osx.
I would suggest to upgrade Acrobat to latest version.

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