I managed to get it all unpacked, but afterwards when typing ./installer.cgi I get the error: "Exec format error. Binary file not executable."

I checked the CHMOD list you have, but no chmod for the installer file. Tried a few different ones, like 777, 755, so on. Still didn't work. Chmoded the 'at' directory to 755, but didn't work. Hmmmmmmmmmmm:ph34r: