Hope you are doing well and sorry to hear that.
Please go to Adobe Acrobat > Preferences > General > Uncheck 'Show me messages when in launch Adobe Acrobat' > Click OK and reboot the application and check
Aloha Harmon (and Amal)
My version: pop up for sign in to my (old) account. Try uninstalling and reinstalling several times.
Amal, the app menu items are not accessible unless I log in first. Is that required now even though I no longer pay for Pro?So I can't access the preferences menu. I force quit just to close the app. Can't open any PDFs.
Appreciate a better solution...
Hope you are doing well and sorry to hear that. Would you mind sharing the sceenshot of the pop up message you get? What is the version of the Acrobat DC you are using? To check the version go to Help > About Acrobat and make sure you have the recent version installed. Go to Help > Check for updates and reboot the computer once.
Also try to create a new test user profile with full admin rights or enable the root account in MAC and try using the application there and check