Go to twitch.tv/downloads and install the Twitch launcher for your OS. Sign in or create an account.
Click on ‘Mods’
And then go to ‘Minecraft’
Click on ‘Browse Modpacks’
Find the search bar and type ‘leehall’
You may continue to the next step while this installs.
At the top of the screen scroll over the 3 lines and click ‘File’ –> ‘Settings’
Click on ‘Minecraft’
Scroll down to ‘Java Settings’ and adjust the allocated memory slider.
We recommend a MINIMUM of 5 gigs (if your pc only has 8 gigs of ram), and 8 gigs if you have 16 gigs of ram in your computer