Are you sure you got the whole installer?
It should be 602.898.228 Bytes in size
I have the whole installer, and I have 5gb on my system drive...
The output for the installer is:
Output folder: E:\DOCUME~1\SCHNOO~1\LOCALS~1\Temp
Skipped: pk3.7z
Skipped: 7za.exe
Skipped: makepk3_full.cmd
Execute: "E:\DOCUME~1\SCHNOO~1\LOCALS~1\Temp\makepk3_full.cmd" "pk3.7z" "C:\UFOAI-2.3-dev\base"
Then it opens a command window and says "system cannot find the file specified..." right before it tries to open the archive.
Just a thought, all my system stuff is on drive E:, not C:, and right before it tries to open the archive, it says "system cannot find the file specified...". Is the installer designed to search for something on drive C:?