I can't run the scenes included in this asset / networking doesn't do anything.
Please follow the first chapter of the provided documentation pdf. You will have to configure your project for networking first as described there.
I'm getting errors referencing the UnityIAPManager related to missing purchasing scripts on import.
Make sure you've correctly imported the latest version of Unity IAP via the Package Manager window.
I'm getting errors referencing non-existent variables in the SceneManagement namespace such as 'sceneLoaded' or other API errors.
The minimum required version is listed on the Unity Asset Store page. If you are still getting errors on that or higher Unity versions, please contact me with more details.
Players can't collide with each other. How do I enable it?
The collision between tanks is disabled on purpose. You can enable it in the physics matrix (Edit > Project Settings > Physics).
Can players find and connect to each other over local WIFI?
Currently no transports are supporting WIFI out of the box, be it in Mirror, MLAPI or Photon. If it is added to their network transports at some point, it will then be automatically supported in Tanks Multiplayer.