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Howdy,
Virtualmin, both Pro and GPL, uses the versions of software included with the distribution you use.
You'd want to choose a Linux distribution that offers the software versions you are interested in.
If you're using 64 bit CentOS 6, it is possible to install a second PHP version though. How to do that is explained here:
https://www.virtualmin.com/documentation/web/multiplephp
thanks you so much for your help andreychek. your link help me alot.
Cheer!