Whether you choose to preserve your CS4 workflow on legacy hardware or transition to a modern solution, understanding your options is the first step toward making informed decisions about your creative toolkit.
If you are a legitimate owner of a CS4 license with a valid product key and are not interested in the newer options, your only avenue is to contact Adobe Support directly. Explain your situation clearly: you own a perpetual license for CS4, but due to the shutdown of the activation servers, you cannot reinstall and activate your legally purchased software. While not guaranteed, Adobe Support may, on a case-by-case basis, be able to provide a workaround, a replacement key, or advice on how to proceed. Be aware that finding support representatives knowledgeable about such an old product may be challenging. adobe illustrator cs4 serial number updated