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Cannot update maps to 2022.20

I cannot update my maps to 2022.20 and get the very helpful Garmin Express error "There was an error installing the update."

I feel like I've searched extensively for a solution without luck, and have seen other people struggling to update their maps to 2022.20 but mostly on other units so I thought I'd post here. 

My device 

- Edge 530, software 9.73

- no courses loaded on the device

- no Connect IQ content (0 of 16 apps installed, 8.0 MB free space).

Garmin Express is running a fresh install of version 7.15.2.0 on Windows 10 (fully updated).

I've tried different USB ports and different USB cables.

It seems from other's experiences that there is a problem with the map file?  e.g. this forum post.

I have tried deleting the map files off the device and reinstalling them with Garmin Express.  That works for the Trail Forks map, but not the Garmin Routable Cycling Map of AU and NZ 2022.20.

Has anyone had this error and managed to actively resolve it (other than just random luck, which seems to work for some).

Cheers from NZ!