That's not possible at the moment, you are in the preview program so will need to wait for a newer public update if you wish to update offline.
Yes it should work fine on Windows 10, however you need to disable driver signature verification, have a look how to do this here: How to Disable...
Try installing the latest system update here, its newer than the update you have installed: Xbox One System Update 10.0.19041.6287 Download...
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