Uninstall safari private launch

Question

Hi, all-
I migrated user account from late 2008 MBP 10.6.8 to late 2014 MBP 10.9.5.
10.6.8 used a "do this when" script to run SafariPrivateLaunch.app when Safari is launched.
In 10.9.5, the migrated script produces an error dialog (assistive services not allowed) which lurks behind other windows.
Safari launches and functions fine, but does switch to private mode.
The error dialog has option to edit the script. This option opens the script in TextWrangler.
I did Spotlight search to find SafariPrivateLaunch.app - no hits
Please advise how to update the script for 10.9.x, and/or how to find the script and app to uninstall.
Meanwhile I assigned shortcut Shift Cmd P to toggle private mode or I can use the menu.
This works as long as I remember to do it.
-B

Answer 1

Any help appreciated. Error dialog offers button to edit which leads to the script pasted below.  So questions remain:
1.  Where is the script stored on the local drive?  If I could find it, I could delete it.
and/or
2. Can anyone suggest edits to the script which would defeat the dialog box and allow it to run?  Goal is for Safari to launch in private mode or to switch into private mode right after launch.
thanks!  Here's the script for SafariPrivateLaunch:
activate application "Safari"
tell application "System Events"
  tell process "Safari"
  click menu item "Private Browsing…" of menu 1 of menu bar item "Safari" of menu bar 1
  if exists button "OK" of window 1 then
  click button "OK" of window 1
  end if
  end tell
end tell