Acrobat Pro no longer working

Acrobat pro is not opening, with an error message saying I need a new license. I purchased cs suite a couple years ago. Not sure what version, but I'm up to pro 9. And now that acrobat reader no longer offers the ability to do something as simple as delete pages, I'm completely stuck. And totally under a looming deadline. Thanks adobe!

Error message:

"Licensing for this product has stopped working.

You can not use this product as this time. You must repair the problem by un-installing and reinstalling this product...."

What do I do? I don't want to reinstall the entire suite for fear of screwing up indesign and photoshop too with this nonsense.

on a mac, yosemite 10.10.5