Installing-MP-Gryphon.md

@@ -24,6 +24,12 @@ Gryphon is compatible with Mac, Windows, and Ubuntu Linux.  For Mac and Windows,
         2. Move to the folder containing the Gryphon executable, for example type `cd Downloads`.
         3. Make it executable: type `chmod +x MP*`.
     * Enable the file to be run: Using Finder, Control-click on the MP executable and select Open.  After doing this once, you should be able to simply double-click on the MP executable to run it.
+    * If your Mac continues to block you from running MP Gryphon then you may need to turn off the quarantine flag:
+        1. Open a terminal window and move to the folder containing the Gryphon executable, for example type `cd Downloads`.
+        1. Verify that the quarantine flag is set on this file: Type `xattr MP*` and observe that text `com.apple.quarantine` is in the list of attributes.
+        1. Remove the quarantine flag by typing:
+
+                 sudoxattr -d com.apple.quarantine MP*
 
 1. Download the latest preloaded examples .zip file, also from https://nps.app.box.com/folder/166624065458.  You may need to right-click the .zip file to download it.
 1. If desired, move the preloaded examples .zip file to another folder.