To download ATLauncher you need to select the correct version. If you are running Windows then you should select the 'Windows (.exe)' button. If you are running a Mac,Linux or prefer to use the jar file, then you should select the 'Linux/Mac/Others (.jar)' button.
Put the exe/jar file in its own folder somewhere on your computer such as on your desktop or documents folder, making triple sure you place it in it's a new blankfolder.
You can create your own universe for other players to explore or venture forth into the wilderness and explore other players' crazy creations. The world will not build itself, and it cannot be contained on your small mobile device. Play WorldCraft on Mac and PC to take advantage of a bunch of extras that other player will not have access to.
Once downloaded and placed somewhere it's as simple as opening it like you do any other application. Once ATLauncher is open you can then go to the 'Accounts' tab andenter in your Minecraft Username/Email and Password combination to add your account and start playing packs.
To play a pack just simply navigate to the 'Packs' tab and click 'New Instance' on any of the packs you want to play. Optionally give it a name and pick a version to installand click Install and the process will run through and by the end you will have a working instance which you can play in the 'Instances' tab.
For a more details walkthrough on how to download and install ATLauncher, please watch the Installation Video below. If you have any issues then please feel free to joinour Discord to get some help.