I have also same problem to install WDCrack.
I am following the steps from post #1, then I am able to install the application first WDCrack - still it is fine.
But when is installation done, there is no change, if reloading the web page nothing new is available - I mean there is no new application(WDCrack) in the apps section and install link/button is hidden again.
I tested all version WDCracks:
Any idea what is wrong?