Would you please provide more information about your problem?
What is the version of your Acrobat Reader for iOS?
Is app download or installation stuck on your iPad?
What happens when you tap the Acrobat Reader icon in the home screen to launch it, does Acrobat Reader "disappear" immediately?
Acrobat Reader for iOS version 15.2.1 was just released to the App Store on November 20th. Would you try updating to the latest version and see if the problem goes away?