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Garmin Express map update freezes updating maps on Edge 820

Garmin Express (windows 10 version) said there was an update to maps available (2019.20) so I started the update which froze during the update maps stage at 84% (left if for several hours and no change).

Each subsequent attempt freezes at 68.9%. Latest version of garmin express and edge is running latest firmware.  Edge has 11gb of spare space. Edge connected to laptop via USB lead.

Since the update froze maps don't load any map street detail on the device only main roads - effectively useless - and I don't know how to either update sucessfully, or revert back to the previous map as it seems to not be on the device anymore?

I've reinstalled garmin express completely. It then updated to 84% again and froze - subsequent attempts are stopping at 68.9% again. I'm happy to update manually if someone knows how I can do that?  

Any help greatly appreciated.