For upgradation, there are some parameters to match, if they are all ok, there is no problem at all.
For a fresh installation, install it as the normal installation. It will start automatically when the virtual drive is mounted, or you may need to double click it. Choose the Advanced option, specify the partition in which it is sought to be installed, and then as per regular way.
After the installation completed, you will see a folder in your c drive named windows.old. You may just delete that