Doug's Check For Update v1.2 is now available. This applet/droplet will check if an AppleScript that has been downloaded from this site to your computer has a newer version available.
This latest version fixes a problem that was occurring on some systems whereby the droplet function was not recognizing dropped files. It could still be used as an applet by double-clicking, but the handy drag-and-drop feature was amiss; this is fixed.
The script, for macOS 10.8 and later only, is free and can be downloaded from this page.