Can’t opened the Pixajoy Editor?

Not to worry!  It is because of the unidentified developer. Your Mac default Gatekeeper setting is “Mac App Store and identified developers”, so it only allow apps that came from the Mac App Store and developers using Gatekeeper. Kindly follow below guide to switch the setting :

Step 1 : Apple menu > System Preferences. > Security & Privacy > General tab
Step 2 : Under the header “Allow applications downloaded from:” > Make sure “Anywhere” is checked > OK
Step 3 : Re-install again “[Application Name]”

Thank you for kind cooperation and happy photo book-making!