You may check your serial number by visiting the Adobe Licensing website or following this simple example: Click on “Product Key” link and follow instructions. For the purposes of this tutorial I will assume you already have your product key. For those who don't remember it, it is located under the product details. You may use a different key, if you want. If you are still here, please go to the Adobe Licensing website and find your product key. Once you found your key, click on the “Activate Acrobat with Activation Code” button and follow the instructions. If you are lucky enough the process is complete, or you have encountered errors, please post your questions here. You may find this information useful to you. Please do not forget to add more questions in the Comments section with all of them related to this tutorial. The Adobe Acrobat Activation Code: (Note, we are dealing with the 64bit software) (1) Go to the Products page (2) Select all Adobe software (3) Click on “Activate now” in Product details (4) After the activation code is shown, press and hold the “Alt” key on your computer until the “Product Activation Number” entry appears (5) You may then enter your product key (6) Your product key will appear in a box in the lower area of the screen (7) Just click on “Install” button to install this software (8) After the installation is complete you can log in with your license key or your “product key” to use the product. Acrobat Xi Pro Acrobat Pro Activation Codes: You can only get serial numbers for 64bit versions by activating with the product key and the activation code. When looking the product page of every Adobe Acrobat Pro 32 version you will find the serial number shown next to the activation key. These key can be used by all installations of Acrobat Pro software! (Note, on Windows Vista you can get the activation codes by right-clicking the product entry of Adobe Acrobat Pro and select “Activate with ActivationCode.pdf”.