how to get older FreeBSD port

[Miroslav Lachman]

Wojciech Puchar wrote on 2017/04/21 19:58:
> i need virtualbox-ose 5.0.26 and virtualbox-ose-kmod-5.0.26

You need to checkout old version of ports tree from SVN and then build 
your ports.

If you want just this older port but everything other newer, then you 
are calling for troubles. There can be some incompatible changes in 
libraries or ports framework.
But you can try portdowngrade anyway: 
http://www.freshports.org/ports-mgmt/portdowngrade/

Miroslav Lachman