since yosemite, ai cs5 won't open

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hi - all my other adobe products open, except for ai cs5.1. the msg that I receive is: An unknown error has occurred (-50). Adobe illustrator will quit now.
has anyone else experienced this?
thanks!
 
Joined
Nov 28, 2007
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Blue Mountains NSW Australia
Your Mac's Specs
Silver M1 iMac 512/16/8/8 macOS 11.6
Have you tried re-installing CS5? Have the activation code handy.
 

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