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Please email questions about using Oracle's VM VirtualBox on campus. See more information on determining whether you have an extension pack installed, including how to delete it if you decide to do that. If you use the Extension Pack for educational purposes (teaching and learning), you may qualify for an exception to paid licensing.
If the Base Pack meets your needs, it is the free choice. The error above means you are installing the wrong extension pack, and since its not the right extension pack it wont be supported by the version of. If you are currently running VirtualBox or if you download it in the future, be aware that use of the Extension Pack will require your department to purchase a license. Oracle VM VirtualBox Extension Pack is an Oracle proprietary product available under PUEL License. Oracle VM VirtualBox Base Pack is an open source and free product under GNU General Public License, version 2.
It is not always clear that installing or upgrading to the Extension Pack is not part of Oracle's free offering. Many members of the campus community use Oracle's VM VirtualBox to create multiple virtual machines on a single computer.