Adobe Acrobat can be activated using the following methods:
If the trial message persists, go to Help > Sign Out , then sign back in and restart the application. 2. How to Activate Using a Serial Number (Perpetual)
Activating premium features on the Acrobat Reader mobile app requires linking to a subscription.
If you are already in trial mode, go to Help > Activate (or Help > License This Software ) and enter your serial key.
Alternatively, you can register your product on the Adobe website under Plans and Payment > Products to link the serial number to your account. 3. Activating Offline