Introduction

This article will helps you to remove “unknown publisher” on Windows Defender

Instructions

It has to be signed with a trusted signature to display the publisher name.
Click View certificate --> Install certificate (after install refresh and make sure there is no cross symbol on the certificate information logo)

if still issue, then import it manually:

1. 1Click Start, click Start Search, type mmc, and then press ENTER.
2. On the File menu, click Add/Remove Snap-in.
3. Under Available snap-ins, click Certificates, and then click Add.
4. Under This snap-in will always manage certificates for, click Computer account, and then click Next.
5. Click Local computer, and click Finish.
6. If you have no more snap-ins to add to the console, click OK to return to the following screen.
7. In the console tree, double-click Certificates.
8. Right-click the Trusted Root Certification Authorities store.
9. Click Import to import the certificates and follow the steps in the Certificate Import Wizard.

Then rebuild the installer and check it.