Raw Therapee 5.5 won't set Photoshop as External Editor...

Hello! Thanks for the reply. Photoshop is at: C:\Program Files (x86)\Adobe\Adobe Photoshop CS6

So I’ve tried both the built-in Adobe Photoshop Installation Directory (2nd ‘middle’) option, and also the command:
C:\Program Files (x86)\Adobe\Adobe Photoshop CS6\Photoshop.exe

Neither works at all. But Photoshop itself works fine.