You can't; yu'll have to give him the application and all of ur data source so that he can alter things and so on.
Qlik has made the Desktop version free and thus, they made it in a sort that it can't be used in a work environment; but only for personal testing.
With that, people who get to like qlik sense are "forced" to purchase the paid version => the entreprise edition
To colaborate in free edition you might consider the cloud version as you can share with limited number of people but the functionality is more resistricted i.e no extensions.
If you want to colaborate professionally you need to be using the server version or business cloud but there is a cost to that.