So this seems to be an old problem but none of the fixes I have found seem to work. I have only had this for a couple months but now all of a sudden when I open acrobat dc it will ask me to sign in and then immediately close after signing in. No matter what I do it wont stay open.
Hope you are doing well and sorry for the trouble. As described the application closes immediately after signing in.
Would you mind sharing the version of the Adobe Acrobat/Reader DC you are using? To check the version go to Help > About Acrobat and make sure you have the latest version 21.01.20145 installed. Go to Help > Check for Updates and reboot the computer once.
You may also try to turn off the protected mode for testing (Win Only) Go to Edit > Preferences > Enhanced Security > Uncheck 'Enable protected mode at startup' Turn off the protected mode and uncheck Enhanced Security > Click OK and reboot the computer once.
Note: Please turn on the security after testing to avoid any security risks.
If it still doesn't work, please create a new test user profile in Windows with full admin rights and try using the application there and check.
Amal, I'm afraid I can no longer try those things. I had bought and paid for Acrobat DC every month since October. It worked fine until a week or two ago. After trying everything I could find it still wouldn't work and in the Creative Cloud said that acrobat was up to date.
Today I decided to completely Uninstall everything Adobe and and just reinstall the creative cloud software and all. Now it tells me that Acrobat DC is not available for my computer so I can no longer install it.
Quite frustrated and feel as if my time and money have now been wasted.