Download and install the Product Key Finder program on your computer.How to Find Your Lost Adobe Acrobat Serial Number? In just a few simple steps, you can find the serial number for your copy of Adobe Acrobat on your computer. Product Key Finder is a utility for retrieving lost serial numbers from Adobe Acrobat, Adobe Acrobat Pro, Adobe Acrobat X, Adobe Acrobat XI. Need to transfer Adobe Acrobat to a new computer but lost your serial number? How do you find Adobe Acrobat Pro serial number before formatting your hard drive? If you somehow lost your serial number, there may be a way to find it as long as Adobe Acrobat is still installed.