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How do I verify the PGP installations files before installing them?

Created: 03 Apr 2011

I've downloaded the trial for PGP desktop for Windows.  The first unzip produces and

Unzipping the inner zip produces PGPDesktopWin32-10.1.1.exe and PGPDesktopWin64-10.1.1.exe

How do I verify that these PGP installation files are valid before installing them (that is, without already having PGP)?  Are there shar1 checksums available or some other way to do this?