A Notification prompts or alerts you of the following.

"To Logon, license is expired, not activated or not valid."

You will need to sign into Adobe. 

Launch the Program Adobe Acrobat DC

Select Sign In Now

Enter Email Address and Continue:

Select Company or School Account. 

 If prompted Enter your RAR Password. and Sign in.

Note:  If you receive the Message "You have reached your device activation limit."

A list of the devices where your account is active is displayed.

Select one or Both and Sign Out.

The device that you are currently on "This Device" will be Activated.