We will cover 2 ways to do this here: The official method that requires your Adobe ID account and password you used when you first activated the software, and a convenient trick that needs a product key finder program. Step 1: If you do not activate the software, you will not be able to use the software to edit texts and images in PDF document. If you are using other versions of Adobe product, the steps also work. In this article, we will show you how to find the serial number for a paid Adobe application, then use it to license and activate Adobe program.