Thanks for all the input.
2. I tried rebooting the system using the Shift/Restart method and the disabling 'signed' driver requirement. This allowed me to re-install Assisstant 2 v1.05. With this I was able calibrate the vision senors and firmware, but did not allow me to access the SD card. When I reboot the system you lose the functionality of firmware updates and vision calibration. To regain it you have to uninstall Assistant 2, reboot the computer with the Shift/Restart, etc. proceed and re-install Assistant 2.
You don't need to reinstall Assistant after a reboot. What you DO need to do (if you wish to use Assistant after that reboot) is to again go through the special restart where you disable Driver Signature enforcement. If you do this, then Assistant 2 runs just like before. No need to uninstall/reinstall.
There seem to be some misconceptions about the Windows 10 problem:
1) I believe this problem only affects 64-bit versions of Windows 10 (I could be wrong, but I have no way to test a 32-bit version of the OS.)
2) With this latest version of Assistant, you won't be able to mount the Mavic itself as an SD Card (not the Video SD card, I'm talking about the storage within the Mavic itself.) The only way to retrieve the .DAT files from the Mavic is to extract them with DJI Assistant. I also have been told the Mavic itself has never shown as a Drive on the computer- only the Phantoms have done that.
3) I could care less about the ability to transfer the videos from the SD card to the computer via a USB cable. It's WAY to slow as this interface is not USB 3.0 compliant. I much prefer to remove the SD card and insert it into a USB 3.0 Card Reader. Either way, I've NEVER been able to see the SD Card as a Drive on my Windows 10 computer when it is plugged into the Mavic. And again, that doesn't bother me.