To download the Twitch app go to feed-the-beast.com and click download now

If you have downloaded the Twitch app from the Feed the Beast website please skip to step 4

Step 1

Click the Mods button at the top of the screen

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Step 2

Click Minecraft

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Step 3

Click Enable Minecraft and on the popup click Yes, Enable Minecraft

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Step 4

When Twitch has restarted click Install

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Step 5

Click the Browse FTB Modpacks and browse for your desired pack

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Step 6

Click Install on the pack you want to download and wait for it to download

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FTB Launcher For linux users or as a last resort for Windows/MacOS users