I have the same problem and it seems that everyone that has qlik sense 2.1.1 has this problem. Visit the qlik branch web site (just search the extension there and read the comments below). They'll tell you how to get it to work. I tried to paste the lonk here, but it doesn't want to show the whole link.
I got it working in my qlik sense now. After I put the extension in the extension file and closed the qlik sense desktop, the extension was there once I opened it again. It didn't work when I did it yesterday, but somehow it is now.
Hello Rawad! How are you? Could you clarify me how to create the What if variables? Are they in master items? I`ve downloaded qsVariable from qlik branch. It would be very helpfull if you send me an example.
Personally I don't recommend using the QsVariable extension. If you are looking to use a slider, the lowest value would be 0 (No negative values can be used).
Instead you can use the Range Slider extension (Can also be downloaded from QlikBranch). From the Range Slider object you can then define a variable where the slider values will be stored. Hence we don't need to use master items.