MANUAL_INSTALLATION.md

Embedded Framework Installation

cd to your project directory, initialize git, and Add MessageKit as a git submodule by running the following command:

$ git submodule add https://github.com/MessageKit/MessageKit.git

cd to the new MessageKit folder and trigger carthage update by the following command:

$ carthage update --platform iOS

Open MessageKit folder, and drag the MessageKit.xcodeproj into the Project Navigator of your application's Xcode project. It should appear nested underneath your application's blue project icon.
Select the MessageKit.xcodeproj in the Project Navigator and verify the deployment target matches that of your application target.
Next, select your application project in the Project Navigator (blue project icon), navigate to the target configuration window and select the application target.
In the tab bar at the top of that window, open the "General" panel.
Click on the + button under the "Embedded Binaries" section.
You will see two different MessageKit.xcodeproj folders each with two different versions of the MessageKit.framework nested inside a Products folder.
Select the top MessageKit.framework for iOS and the bottom one for OS X.
Voila! Now you can import MessageKit and build the project.