This error usually comes when you move adobe folder to different location from root drive and try to update the application. I would suggest you to Uninstall the application and remove all adobe folders. Restart your machine and install the application again and check for updates. It should Work.
Thank you for your prompt reply and suggestions!
I haven't moved any folder at all, but I will try what you suggest and see if that solves the problem.
Thank you very much for taking the time to help me
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Or you could try just direct downloading and applying the update for Illustrator.
You can find them here:
Thank you Luis!
I downloaded the 2 updates available on the links you've given me, and now I'm up to date and happy
Thank you both so much for your time and help!!!