To Switch Between Modpacks Change The Branch From Main To The Modpack You're Looking For, download it and you have the latest release
Note: If You Want A Older Version Then Go To Releases On The Sidebar And Select The Version You Want
The Modpack Creation Tool Downloads Are Located In The Packages sidebar
Just Click The Release You Want
Go To https://cemodpacks.github.io/modpackcreator To See All About It
Note: Click Try Online Demo > New Project To Start