Sorry to hear that the lifetime updates aren't working. I know that in the past the updater had "issues" that were thought to have been rectified. Something is obviously still wrong.
There is, however, another way to download the map update onto your SD card. The instructions below will help you to to complete the map update on your device and to install the maps onto your SD card.(1) Click here to visit the Garmin Map Updates page.(2) Click on Automotive.(3) Connect your Garmin device to the computer. Once your device is detected, click on Find Map Updates.(4) Click the tab named Device Content.(5) Click on Download on City Navigator North America NT 2016.XX where XX is the latest month update, like 06 or 04, whatever the most recent month is.(6) Under Option 2, click Garmin Map Update Application to begin the map update on your device.
Once completed, you will have the latest maps on your device.
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