Rad,
The "Invalid/corrupt signature" could be saying nothing more than the download you got was fouled up somehow in transit. It happens sometimes.
The "signature" is nothing more than a mathematical "magic trick" that takes all the bits from the file you downloaded and creates a correspondingly "magic" number. That same trick is also applied to the
original file from its creator, and the assumption is that if the magic number
they provide and the one that is computed against
your version of the file match, chances are the file is an absolutely correct and identical copy of what you requested, because the chances of two piles of bits producing the same "magic number" are pretty darned small. Thus, if the "magic numbers" don't match, it essentially says the files aren't the same.
While I like Samsung phones (a lot), I've had iffy experiences on some of their phone-to-PC tools, so I honestly wouldn't invest a great deal of time trying to make that particular thing work. Figure out what kind of card your phone needs, transfer the pics to them, and then you should be able to USB-connect the phone to your PC and snag them from there.
Hope that helps (clear as mud, right?)
Interrupted downloads, connection dropouts, and just plain old intermittent errors can occur in file transfers...not very often these days, but they can happen. I'd just try to download the file again.
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