2 Replies Latest reply on Sep 11, 2013 10:23 PM by Barry_M81

    The extension 'GuideGuide' does not contain a valid signature. The extension will not be installed.


      Hi guys, looking for a bit of help as I can't install an extension for Photoshop. Managed to install it on another machine in the office and it works great.



      iMac OSX 10.8.4

      Photoshop CC

      Extension Manager CC


      Please let me know if you need anything else.