What steps should I take if the "hcnetsdk.dll 7" error appears after a recent iVMS-4200 update?

First, try rolling back to the previous iVMS-4200 version if possible, to determine if the update is the cause. If the problem disappears, you know that a bug with this version is happening. Check the Hikvision support website for known issues or workarounds related to the update. Otherwise, reinstalling the updated version and confirming all necessary components are in place can help.