You can install and activate Acrobat on up to two computers. If you want to install and activate it on a third computer, you must deactivate it on one of your previous computers. Don't worry, the Acrobat installer will prompt you to do so. Follow the onscreen instructions.
If you can't find the downloaded file, do the following:
Your Adobe ID is the email address you used when starting a trial or purchasing an Adobe app or subscription. Find solutions to standard Adobe ID and sign-in issues.