If you cached AK_West, AK_East, US_NW or US_NE last night (Oct19/Oct20) and you want to update the file, please un-select the region, tap Start and the checkmark disappears. Then re-select the region again and tap Start to re-cache it again.
If you’re caching data as of 7.45 AM PDT or later you’re automatically getting the right data.