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"There was an error installing this update" - Garmin GPSMAP 66i

Reinstallation of TopoActive Australia & Oceania 2025.10 fails, and the only message I received is  "There was an error installing this update."

I'm trying to reinstall the map because it is no longer displayed following a recent update; the previous version was fine, but since the update, the map simply is not visible.

Any tips for troubleshooting this?