Great, I didn't expect to get stuck so early on. I installed Virtualbox with no problems and tried to install the extension. However, this gave me the following error messages: The extension pack is already installed with the same version. Would you like to reinstall it? Chosing YES as I've certainly not installed it before gives me: Failed to install Extension Pack Details: VBoxExtPackRegister returned VERR_VERSION_MISMATCH, pReg=0000000000000000 ErrInfo='VirtualBox version mismatch - expected 5.0 got 5.1'. Result Code: E_FAIL (0x80004005) Component: ExtPackManagerWrap Interface: IExtPackManager {edba9d10-45d8-b440-1712-46ac0c9bc4c5} How do I check what is installed and how to fix this, if necessary at all? I downloaded both Oracle VM and the extension pack a couple of days ago together. Thanks. edit: looking into the Preferences of VB I see that the extension pack 5.026r is installed, which seems to be the one I downloaded, and which just refused to get installed.
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