I've been using Adobe Acrobat XI Pro v11.0.10 for over 8 years now. I didn't like the newer version so I've been happy to stick with this version and its matching Distiller. It has been working fine until the other day when it suddenly claimed to be unregistered and reverted to demo mode. I had made no changes to my computer so I'm confused why this suddenly happened. All my other Adobe apps (inDesign, Photoshop, illustrator, Audition and more) continue to work fine. When I sign in to my account, I can not find how to authorize these to programs. I've searched this forum and found others with the same problem but all solutions were for Windows computers, I'm using a MacBook Pro. I'd appreciate any advice or suggestions you may have. Thank you.
Same here... multiple Macs running OS X 10.11.6 with Adobe Acrobat XI Pro suddenly no longer work. We didn't change anything.
On launching Adobe Acrobat XI Pro or Acrobat Distiller v11.0.23, the application closes and the Adobe Application Manager opens, says it is Validating License Status Online and "Please wait for a moment..." and then it just spins.
Adobe won't help becuase they no longer support the product.
Did you ever register it with Adobe? If so, it should appear in your account on Adobe.com, under My Products, or something similar. However, Adobe doesn't offer the installer for older versions any longer, so if you didn't keep it, you're out of luck, I'm afraid.