I saw the same when I tried download with my WIN PC (some minutes ago, Seamonkey Browser) and also with an Android 2.1 Tablet in the afternoon (14:30 UTC) Problem has been confirmed on <discuss@de.libreoffice.org> "[Webseite] ImpressRemote laesst sich nicht runterladen?"
New due to confirmation on mailing list <http://listarchives.libreoffice.org/de/discuss/msg14731.html>
Now WFM with PC and Tablet.
file modes are verifiably correct now.