Strange, I downloaded it and it all worked fine - I have actually been using it this afternoon with no problems.
The example qvf app also loaded and worked fine for me, although it does use the qsvariable extension, but that is available on Qlik Branch
A few thoughts :
- Are you using an old version of QlikSense ?
- Do you have problems with any other extensions ?
Also could you clarify what you mean by "The example app cannot be loaded on Qlik Sense Server or Desktop"