Just in closing, and for completeness: Many devices such as old StreetPilots etc are not supported by Garmin Express AT ALL. Although all nuvi devices can use GE, some including your 885T are only partly supported. Several nuvi models and series, 295/3xx/5xx/6xx/8xx/5000, just can't use the 'load to SD feature' during update with GE, but they can load to SD using MapInstall. So it's fine to use the nuvi clone/stunt double method with GE for LM maps on your 885T mate, or you can just load the PC install version to your PC and use use MI to load the entire entitled LM area to an SD.

Info from Garmin FAQs:
Can I load maps directly to an SD card during a map update?:
Code:
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What do I do if my device doesn't support the SD card feature during the Garmin Express map update?:
Code:
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How do I install mapping to my device with MapInstall?:
Code:
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Thread marked solved.