Currently uniCenta oPOS application Installers for Windows, Linux and Mac OSX are hosted on the uniCenta oPOS Project at www.sourceforge.net/projects/unicentaopos
In the past uniCenta oPOS had a couple of site, which was great, but keeping three sites up-to-date and maintaining was a bind.
www.unicenta.com is now uniCenta's main site.
uniCenta oPOS Installer Downloads
Soon be available from here, but for the time being available on Sourceforge
uniCenta oPOS Source Code
Only availabe from this site: