It's possible to upload anything here, as long as it's not illegally obtained. I noticed that phpfox is a paid script, so unless you bought it don't even bother.
If you have bought it, you probably won't be able to install it.
* Web Server API - Apache, CGI, FastCGI and ISAPI
* Supported Operating System - Solaris, Linux, BSD, Windows IIS and Mac
* PHP Version - Minimum - 4.3.3
* MySQL Version - Minimum - 4.1
* GD complied with your PHP Build - Yes
* SendMail - Yes
* PHP safe mode - OFF
* PHP memory_limit - 32M
* Minimum Web Space - 15 mb
We have sendmail turned off and php safe mode ON on the Zymic servers.