Papppous,
install files ipk, no zip !

If unzip this zip file in your PC = fix_official-feed_powerpc.ipk

copy file "fix_official-feed_powerpc.ipk" in your Dreambox

/tmp/fix_official-feed_powerpc.ipk

Click Blue button - panel All In One - Red button (ipk) -
sellect Feed: TEMP - OK
marker (OK) line file name * fix_official-feed_powerpc.ipk
and press Red button for "install".