It looks like the majority of the installation is not included in http://osticket.com/dl/osticket_1.6.0.tar.gz(http://osticket.com/dl/osticket_1.6.0.tar.gz).
Here's the list of files included:
XXX@XXX:~/XXX/XXX$ tar -xzf osticket_1.6.0.tar.gz
XXX@XXX:~/XXX/XXX$ ls -al osticket_1.6.0total 60
drwxr-x---+ 4 XXX XXX 4096 2010-02-09 07 .
drwxrwx---+ 3 root root 4096 2011-08-24 23 ..
-rw-r-----+ 1 XXX XXX 15425 2010-02-09 07 LICENSE.txt
-rw-r-----+ 1 XXX XXX 575 2010-02-09 07 README.txt
drwxr-x---+ 2 XXX XXX 4096 2010-02-09 07 scripts
drwxr-x---+ 8 XXX XXX 4096 2010-02-17 11 upload
