since yosemite, ai cs5 won't open

[okulcz]

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!

 

[harryb2448]

Have you tried re-installing CS5? Have the activation code handy.

 

[chas_m]

My AI CS3 still works in Yosemite ...