I just did an update for my 740 and the Aviation Databases, same dates, updated fine with my Windows 10 Asus 2n1 10" tablet. If you're still having problems, try copying the entire contents of the SD card to a folder on your Windows computer, and copy it back onto a different, freshly formatted SD card. It's possible that your current card has a bad spot or that particular file is corrupted and cannot be accessed/deleted/overwritten. If you don't have another card available (I use a 32G card), you can try reformatting your existing card after you copy it to the Windows computer. It's not a boot disk so a simple copy works fine. This is also a good way to have a backup card with you, if you're so inclined. The only thing that won't work if you copy to another card is the Streets GPS driving software (it is "married" to the serial number of the card it came on).