METHOD 1
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1) Instal the app in trial mode (no serial required).
2) Go to the DLL folder and copy the dll file for 32 or 64 or both and paste & replace the ones
in the CS5.1 program directory, eg copy and paste and replace to here;
C:\Program Files\Adobe\Adobe Photoshop CS6 (64 Bit)
C:\Program Files\Adobe\Adobe Bridge CS6 (64 Bit)
and/or
C:\Program Files (x86)\Adobe\Adobe Photoshop CS6
C:\Program Files (x86)\Adobe\Adobe Bridge CS6
and/or
C:\Program Files\Adobe\Adobe Photoshop CS6
C:\Program Files\Adobe\Adobe Bridge CS6
Here's the link for the DLL files:
https://www.dropbox.com/sh/fgtcrjmew8albgu/zLdBfk7vfE?v=0swn[url]