i need help with this updater thing.

https://www.youtube.com/watch?v=[YOUTUBE]WPS-Mcz76V4[/YOUTUBE]

um i can get it to kinda work after I've been playing with that code for like 2 hours i went blank idk what to do. im just 100% out of ideas because no matter what it says that there is a new version available even if its the newest. and if some one helps me with that i want to make it so if there is as newer version it will show the dl link for the newest version plz.