no sorry for the misunderstanding they are the official stern downloads.
When you go on the stern site do the SD-Card download section. You can copy the link and just replace the version number. (maybe in in editor).
This link entered directly entered into a browswer should start the download for old Versions.
They still have the software on the server, but no visible link to it
I just wanted to let you know that downgraded to version 1.21 with the 1987 version and that worked.