this is not a supported use case in the free Destkop. I've answered the same question already in this thread: access remote Qlik Sense
In order to be able to use your mashups globally (sharing it with other users) you would need to install a Server. Then you can use the IIS or other web servers for making the mashup accessible. Security will be still controlled by our Proxy.
Let me / us know if you have further questions.