Purchase a license at NewTek store
After purchasing the license, download a compatible version of the application from this link https://camstreamer.com/download-app
Install the downloaded application directly on the Axis camera in the Apps section.
Make sure the camera has at least FW 10.9 before installing (new FW can be downloaded here https://www.axis.com/support/firmware).
After installing the application, activate the code in the Apps section ("Activate license automatically").
For offline activation use this link https://www.axis.com/support/license-key-registration#/registration and activate the app with the generated key.
Start the application and use the Open button to open the user interface with the settings.