Gotta love it..

We're not in a position to install Dot Net 3.5 on hundreds of customer machines, sadly.

We had to use an alternate Checksum method using the CertUtil tool, but again, on Server 2008, it doesn't support SHA256, only R2 and higher. So - ErrorCheck and use another tool.

Fortunately, only about 15% of the 380+ installed server base is 2008, and les than 10 are still 2003.
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Actually I am a Rocket Scientist! \:D