Safe to upgrade from 7.5.4 to 8.0.1 on FreeBSD 4.9?

[Whistler]

I have a dozen servers running Plesk 8.0.1 on FreeBSD 6.0, Ubuntu, Debian etc. - but I have a server still running FreeBSD 4.9 and as default the Plesk installation won't run unless its a 4.11 distro.

But does anybody know if it's safe to trick Plesk 8.0.1 to install anyway on the 4.9 distro?

 

[CyberTech]

Maybe someone can post how to upgrade freebsd 4.9 to 4.11 without breaks plesk.