Adobe discontinued PageMaker in 2004 (replaced by Adobe InDesign). You cannot buy a new license from Adobe.
is a professional-grade, open-source desktop publishing application available for Windows, macOS, and Linux. Adobe Pagemaker 7.0 Serial Number Download
If you are looking for a serial number to recover old documents, there are safer modern alternatives for opening .pmd files: Adobe discontinued PageMaker in 2004 (replaced by Adobe