If you are already installed on two computers, you need to deactive one first: : how to deactivate software. This frees up one activation so you have the option to install the software on another computer at any time.
If you don't have access to your previous computer because you replaced a hard drive, upgraded your operating system, formatted your computer before deactivating your software, or your computer died, you can ask Adobe Support to help you deactivate from a machine you cannot access. Have your serial number or Adobe ID ready, and then contact us.
You can download the appropriate version from here:
Suites and Programs CC 2014 | CC | CS6 | CS5.5 | CS5 | CS4 , CS4 Web Standard | CS3
After downloading the installation files, see these instructions to extract the files and install your product.
Pattie