This is a zipped file with the Paddy Module directory for Lightroom. It is not a complete installer.
(1) Download the Zip file
(2) Close LR
(3) Copy the Zip file into the LR module directory.
Under Win 7, this is
(4) Extract the Zip archive to that directory using WinZip "Extract here"
(5) Restart LR
Paddy should be available as module in LR now