Jan 09, 2020  The issue is that even if you install the plugin the message will still show up and bother you everytime you need to access your Hikvision IP camera/NVR/DVR. The plugin is installed but looks like something went wrong because the message ask to install again and also says: “close the browser when installing the plug-in”.

From Dahua Wiki

Configure Internet Explorer Security Settings

Prerequisites

• NVR or IPC
• IP Address of the NVR or IPC
• PC
• Internet Explorer

Video Instructions

Step by Step Instructions

1. Open Internet Explorer.

2. Click on the gear icon in the upper right hand corner

3. Click, 'Internet Options'

4. Click the, 'Security' tab.

5. Click the, 'Trusted sites' icon.

6. Click the, 'Sites' box immediately below the zones.

7. Input your devices IP address into the top box, click, 'Add' and then, 'Close'

8. Click, 'Custom level..'

9. Click the drop down box at the bottom of this window, and change the setting to, 'Low'

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10. Click, 'Reset' and then, 'Yes' in the confirmation dialogue.

11. Click on the, 'Advanced' tab.

12. Ensure the following are ENABLED:

• Browsing->Enable third-party browser extensions
• Security->Allow software to run or install even if the signature is invalid

13. Click, 'Apply' and then, 'OK'

14. Reboot your computer, and try to access your system.