im sorry to break it to you, but the entire fandom has been waiting for close to 4 years for it to be finished. it's probably not going to happen.
Do you mean Liar2Liar Pants on Fire cuz that looks like the full version
The first game is Liar Liar then Liar Liar 2 (Pants on fire)
Both are free here on itch.io, and so if you just go to the developer's home page (on this site a.k.a. itch.io) you'll find them.