If you are accessing applications via the Leap Motion app store then unfortunately this will be why you are having issues trying to get these to work correctly.
We retired the App store on June 30th 2017 and these apps are now available via the Leap Motion Gallery which is available here.
Please find our FAQs regarding this retirement here which should answer any questions that you have about this:
If you are using Windows 10 with our older V2 software please make sure to apply the hotfix here to resolve a compatibility issue caused by a change in Windows in the Fall Creators Update.
Please also be aware that our older desktop demos will require our V2 software whilst our newer VR demos are compatible with our later SDK releases from V4 onwards. Sculpting requires this V2 SDK and can be found on the gallery here.