If the problem is the unzipping (extracting) just use a program like 7-zip (www.7 zip.org) to extract it.

I have a question too, I formatted my Garmin 1490TV (FAT32) and now the WebUpdater won't recognise it, although both the SD card and the internal memory appear in My Computer, and are accessible. Any idea of what I could do to make it recognizable to the updater once again?

Thank you in advance.