In the process, I noticed broken links on the releasenotes-page due to a different file naming scheme: The 4.10 release files (and before) were called JMRI.4.10.R419243e.tgz, the 4.12 release files are called JMRI.4.12+Rb6a9bb1.tgz with a + (plus sign) in front of the Rxxxxxxx instead of a . (dot).
This is true for all three MacOS, Windows and Linux.