I am almost sure this is a problem in garage.maemo.org site when accessed with a n800.
When in Opera I try to click the 1.70 beta version and ask for install, it downloads and starts application manager, but the install aborts and when looking at the register I have "corrupted system tarfile - corrupted package archive". The same if I save the debfile from Opera and try to dpkg -i.

BUT... when I download the debfile with wget in a term window as follows:

wget https://garage.maemo.org/frs/download.php/2497/UKMP-1.70Beta.deb --no-check-certificate

the resulting downloaded debfile is well installable with dpkg -i.

So? Where's the bug?