I assume your taking about the free map upgrade that Navman promote. I own a MY 55T. I have not updated to the latest maps yet so can't help directly but thinking that I will one day I took note of these threads on Whirlpool.
MY50T Navman Gps Updates
'Stevosaurus' writes
Not sure if this will help, but i recently updated a couple of MY50T's and used this process, downloaded the email update pdf and 2010 map update (my50t not connected)
after complete turned on gps connected to PC open navdesk, waited a moment pop up came up with update list.
clicked link for navdesk update, it opened ie8 window with d/l links seleted navdesk (not mio). to save target.
when complete selected smartst update, clicked link for smartst update, it opened ie8 window with d/l links seleted save target.
When complete closed all other windows (navdesk still open/active gps still connected) and ran navdesk update exe, when update finished selected restart later, closed all windows (safely remove hardware) gps and moved slider to reset once unit had booted to accept/decline screen, shut down PC.
Started PC when fully booted turned on gps and connected once booted to accept/decline screen, started navdesk when booted ran smartst update, once finished closed all windows (safely remove hardware) gps and moved slider to reset once unit had booted to accept/decline screen, shut down PC.
Started PC when fully booted turned on gps and connected once booted to accept/decline screen, started navdesk when booted followed procedures laid out in Navman_MY-Series_Map_Update_AUS pdf file.
Some of the icons cane be difficult to find at first when following the update steps but had the pdf open when doing it so refered back for clarity.
Hope this helps with the proceedure for update, i found it worked flawlessly for me with the units i updated.
Also i only ran the navdesk update once when updating from same PC, but ran the smartst update for every unit prior to running the 2010 map updates.
Hope this help 
and there was this also
New Navman 2010 maps available
				
			 
			
		 
			
				
			
			
				2024 RRS on the road
2011 D4 3.0 in the drive way
1999 D2 V8, in heaven
1984 RRC, in hell
			
			
		 
	
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