: Older versions of SketchUp rely on outdated built-in browsers (like Internet Explorer or older Chromium frameworks) to communicate with license servers. Modern security protocols reject these connections.
The classic activation servers that validated old serial numbers and authorization codes have been retired or altered. sketchup 2017 pro license key fixed
If you are still experiencing issues, here are the most common solutions: : Older versions of SketchUp rely on outdated