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If you are using Windows, you will need to install a DFU driver on the computer. Zadig is a tool that makes driver installation easy. It can be found at https://zadig.akeo.ie . The Windows operating system, as opposed to macOS or ChromeOS, is not pre-installed with the tools necessary to downgrade a SPIKE Prime hub.
You can use third-party drivers to enable your Windows system to perform a downgrade. It will require administrator rights to install, so users will need to must contact their local organisationorganization's IT staff or administor administrator to help with installation. This is not a tool developed by LEGO Education. The link to the third-party software available on this website is provided “as is” without warranty of any kind, either expressed or implied and such software is to be used at your own risk
After a Hub a downgraded to Spike 2, the DFU driver is not needed, and the Spike 2 hub will work on other Windows laptops without DFU drivers.