CS5.5 Design Premium – Registered Serial Number Rejected After Install (Activation Servers Offline?) Hello folks, This software is legitimately registered to me, and the serial number appears under my Adobe Account page. It’s a TLP license key, originally purchased for our design department. I have the original installer media (ISO copies) as well as the installer download from Adobe’s Manage Account page. When installing on a new Windows 11 system, the installer initially accepts my serial number and completes successfully. However, when I launch Photoshop (or any other CS5.5 app), I’m prompted again for the serial number — and this time it’s rejected with the message: “This serial number is not valid for this product.” I was able to run the software in trial mode for about a month, but that trial period has now expired, and the programs will no longer launch because it rejects my serial number. This serial number is unquestionably valid and tied to the correct media; it’s also listed under my registered products in my Adobe account. Is there any way to