LOL
Your VBer roots are showing.

$objFSO = CreateObject("Scripting.FileSystemObject")
$test = $objFSO.GetFileVersion($InstallPath + "\Acrobat Elements.exe")

Are you sure you are reading the path correctly out of the reg and that it does not already have a trailing hack?
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Give a man a fish and he will be back for more. Slap him with a fish and he will go away forever.