For more information
Open Source Maintenance Fee
To ensure the long-term sustainability of this project, use of the WiX Toolset requires an Open Source Maintenance Fee. While the source code is freely available under the terms of the LICENSE, all other aspects of the project--including opening or commenting on issues, participating in discussions and downloading releases--require adherence to the Maintenance Fee.
In short, if you use this project to generate revenue, the Open Source Maintenance Fee is required.
To pay the Maintenance Fee, become a Sponsor.