Check for Installed Photoshop Actions

PS Extendscript: CheckActions.jsx

//This script works by runnning a specific action in a given action set.  I normally make this action
//do nothing at all, but if it's not present on a user's computer to throw a warning.  This is important when
//scripts rely on specific actions and you want to alert the user that they may not work correctly unless they add or update
//the action set.

actionCheckFail = false;
    
try { 
     doAction('InstallCheck', 'MySetOfActions');
  } catch(e) {
	
     alert ("The correct .atn file is not installed or is out of date.  The script may not function properly or not at all.")
     alert ("The most up-to-date action file can be found at <path>")
     actionCheckFail = true;
}

//Do not allow the script to continue unless the action is present.
if (actionCheckFail != true) { 
     doMainFunction()
} else {}