Yes, that worked!
After WebUpdater, there was no .ZIP file in the unit's Garmin folder at all, also not after reboot.
There is a wealth of information available on this forum. I had a feeling that what I was looking for would have been discussed already. After all: what hasn't been discussed here yet! That's why I indicated in post #1 that I had already spent an hour searching both on Google as well as in this forum (BTW: not only for the file(s) itself, but also the procedure). You may not have read that part, otherwise you probably would have shown some understanding for me asking certain questions in this thread.
While working on this nüvi 550 anyway, could anyone tell me if more required files or folders are missing? Below are screenshots of the root and the Garmin folder. Thanks!
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