Please understand that currently there is no demo for YouBooks for Joomla 2.5
Type in YouBooks in search and you will see that demo is 1.5 only.
YouJoomla Products Compatibility List
Template is completely compatible with any Joomla version
but since VM is a 3rd party extensions
and they have even said that VM update from vm 1.1.9 to latest version is nearly impossible
you can try it yourself
we can not do anything about that thus we do not even want to update the demo to 2.5 for an extension that does not support their
own backwards compatibility. This is why we did not make any demos with VM since.
Every other 3rd party extension that we used like K2 or any of our own , are completely backwards compatible
and converted ( except the vm modules ) .