Sign Windows Installer with innoSetup
https://docs.microsoft.com/en-us/windows/win32/seccrypto/signtool
Create self signed certificate (PTX) in one minute with Delphi:
http://docwiki.embarcadero.com/RADStudio/Sydney/en/Creating_a_Certificate_File
Deploy your app on Microsoft Store:
Sign your installer with your self-signed certificate:
Create a verified certificate:
https://docs.microsoft.com/it-it/mem/configmgr/mdm/deploy-use/create-pfx-certificate-profiles