v3.0.0.beta.3 is in parity with v2.10.2 but without the Messages & Experiments feature support.
On Jan 1, 2022, we’ll remove the Messages & Experiments feature from Mixpanel. For now, if you do not use Mixpanel's Messages & Experiments feature, you can choose to opt into this beta version.
You can use Swift Package Manager to install the beta version:
In Xcode, select File > Swift Packages > Add Package Dependency. Follow the prompts using the URL for this repository and point to branch 3.0.0.beta.