Download the latest iVMS-4200 software from the Hikvision portal.

class Program

: You might be trying to use a feature (like a specific sub-stream type or intelligent search) that is physically not present on that specific camera model. How to Fix or Improve Stability Update Device Firmware

If you are writing your own application using the Hikvision SDK, follow this developer-specific guide.

The SDK can be sensitive to the order of operations.