Hi,
I'm Sumit, here to answer your query at the Microsoft Community.
We can use regedit to turn off the Smart screen. The code-signed issue can be better answered by QA forums for developer and SmartScreen for Enterprise..
https://docs.microsoft.com/answers/index.html
Please add the appropriate tags to your question there.
Next:
In the Windows search,
type cmd, right-click it, and choose run as administrator.
Execute:
reg add "HKEY_LOCAL_MACHINE\SOFTWARE\Microsoft\Windows\CurrentVersion\Explorer" /v SmartScreenEnabled /t REG_SZ /d "Off" /f
Restart your PC.