Steinberg Download Assistant not properly notarized (Setup v1.34.3)

It gets blocked by GateKeeper:

無法打開「Steinberg Download Assistant Setup」,因為Apple無法檢查是否包含惡意軟體。


Unable to open “Steinberg Download Assistant Setup” due to Apple’s inability of detecting whether it has malicious contents.
This app needs update. Contact its developer for more intelligence.

I forced installed it by whitelisting the installer through terminal.

BTW the app icon of the SDA needs update: