Kaleidoscope 4 is a subscription-based product. An active subscription is required to use the app. Once the subscription has ended, you can no longer use Kaleidoscope 4.
If you own a license to Kaleidoscope 3 or Kaleidoscope 2, you can use that for as long as you like, even after having been subscribed to Kaleidoscope 4. Contact us if you require help retrieving your previous license.