I was wondering if there's any way to upgrade my Joomla 2.5 website, with VM2 and a template for Joomla 2.5, to Joomla 3. Downloading afterwards the same template and some other plugins and components for that version...
The question is very frequent. At this time, you can find many answers. Just do your research to find the best answer for you.
For instance, this is one of the possible answers: Upgrade from 2.5 to 3.x overview