for your case, better use updater.

Code:
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NOTE FOR USERS WANTING TO DOWNLOAD SOFTWARE ON ONE COMPUTER AND THEN INSTALL IT TO THEIR
DEVICE USING A DIFFERENT COMPUTER:

1) To download the region file used by WebUpdater, copy and paste this link into your browser
on computer #1:

Code:
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2) Bring nuvi7x5_GCDFile__450.gcd to computer #2 where your device is attached.

3a) Then you can drag-and-drop nuvi7x5_GCDFile__450.gcd onto the WebUpdater icon on your desktop.

3b) Or you can invoke WebUpdater at the command line, passing in the region file as a parameter:

C:\>WebUpdater.exe c:\path\to\nuvi7x5_GCDFile__450.gcd