Download the latest version of the SDK. Current SDK version: 4.0.6
Drag the "TappxFramework.xcframework" file inside the Xcode Project.
Once done you will see the option screen where you must check the same options as in the following screen:
When you have the SDK in your project, you must change in "Frameworks, Libraries, and Embedded Content" the "embed" from the Tappx SDK: