Hi! It seems that the TeamExtreme 3.8.0's Launcher stopped working as of today, for some reason, for any of the latest versions of Minecraft. Download and get your game up to date again by following these steps...
Minecraft 1.14.4 – How to Download and Install
Would you like to play with Minecraft on your computer but, for any reason, you don't want to log on to Mojang servers? Now you can!! This launcher should keep you up to date with the latest versions of Minecraft automatically, plus it also allows you to play with all the previous ones, like 1.7 and 1.12. 🙂