How do I make a Update Notification Script?

I am making an admin script and I want some way to make a notification that tells whoever got my admin script to reinsert the script to update it. I don't want the full script can anyone just tell me how to? By the way, anyone who wants my admin script can get it here: https://www.roblox.com/catalog/946796347/redirect

For example, I update my Admin Script and when a user joins their game and they have my admin script it'll show a hint saying to reinsert the Admin Script.