Can you edit the file, it's in webapps/root/update.html --
Just remove the backslashes // in front of:
//installedVersion = '0.4.7';
in the compareVersions function. This will allow you to test download again.
Ok... now I get two download buttons on both 7874 & 7875, but links work only on 7874.
Hmm, probably because of https.. Perhaps the download links should also be https - jean-luc?