Installing a Modpack from the Twitch App
Navigate to the Minecraft Tab in Twitch App. From here, click "Browse Modpacks". This will lead you to a page that by default is sorted by Featured Modpacks. In the top right is a search bar. The modpack you are looking for, provided you have the correct name, should be sorted to the top. Once you find it, simply click install.
After the pack completes its download an installation, it will now appear as a new profile under your Minecraft tab,
Installing A Modpack from CurseForge
This section will walk you through manually downloading a modpack from CurseForge and importing it into Twitch App. Although we typically recommend that you download all modpacks through the Twitch App using the browse feature, you might want to download an Alpha or Beta version of a modpack, without displaying all Alphas and Betas in the app.
To do this, you will first need to navigate to the modpack you would like to import on https://minecraft.curseforge.com. Once on the modpack page, you will then need to click "Files". This will take you to a listing of the files that have been uploaded for that modpack. Click on the version of this modpack that you would like to download and import into Twitch App.
Once the modpack has downloaded, which can vary in size from just a few kilobytes to several dozen megabytes you can then easily import this into Twitch App as a new profile. First, click the Minecraft Tab and look for the "Create a Custom Profile" button. Clicking this will give you the standard "Create Profile" window. If you look towards the top, you will see a link to instead "Import" a profile:
Clicking this button will prompt you to select a file. Navigate to the profile that you would like to import (the file exported at the top of this article, or one that a friend or family member has sent you) and select it. This will automagically install that modpack as a new profile under the Minecraft tab. You don't have to set anything else up, it will install the modpack just as if you had used the Twitch App modpack browser to install it.
Now there is one thing to keep in mind when installing a modpack this way. Unlike installing it via the browse feature in Twitch App, importing does not maintain a link to the original project, so you won't be notified of updates. Again, we recommend using the built in browse feature to search and browse packs within Twitch App, but we also understand that this is quite useful for sharing and testing as well.