Hi Jack,
As Doug suggested above, you only need to choose either set the SQLSecurityCheck in the Registry or install the add-in on your computer. As I noticed that you didn't have a clear understanding on how to add SQLSecurityCheck in the Registry, please try to follow the steps below to set up.
1: Press Window key + R and key in " regedit" in the dialog
2: Select OK to run Registry Editor
3: Locate the following registry key: HKEY_CURRENT_USER\Software\Microsoft\Office\16.0\Word\Options
4: Right click on Option folder and create DWORD registry key
5: Rename the created key as " SQLSecurityCheck"
6:Double click on SQLSecurityCheck and set value data as 00000000, and click okay to save.
7: Restart your computer.
If the issue still exists, please also provide as the screenshot of your Office version. You can go to File > Account > Under Product Information to check it.
Notes: To protect your information, please remove any private information before you share the screenshots with us. Thank you.
Best regards,
Dihao