Your error "ERROR: can't run D:\Garmin\cure\updater.exe" is probably only due to user account restrictions on your PC or Updater.exe not being in it's proper place. The cure firmware was made, indicated by the line above that, i.e. "Processing OK :)" and so the cure RGN file would be in the same directory as GarminCure3.exe but in a folder "GarminCure3-TEMP" and in there will be another named, for example, "GarminCure3-B52E1C07" but with different last 8 characters which are a hexadecimal identifier, and inside you'll find "097201000630.rgn".
I can make a kit for you to flash the cure in preboot (just ask) but really all you need do is locate that RGN file as advised above and drag it manually onto Updater.exe. You can also put Updater.exe in the same folder as the cure RGN and run the EXE. Once the cure fw is loaded you should have Mass Storage Mode available to delete the faulty file/s loaded by GarminExpress (likely the new detail map *.img file if you were updating the map), then re-load your original RGN firmware to complete the process.
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