Installer exe not recognised as safe

The installer exe file (ArrangerKing-WIN.exe) is not recognized as safe by Windows Defender SmartScreen, which says it “prevented an unrecognized app from starting. Running this app might put your PC at risk.”

However, a scan using MalwareBytes revealed no malware.

The Microsoft Defender message is presumably because the exe has not been “signed” so can I recommend that you do this with future releases please.

(Also, I couldn’t find “install”, “installation” or “installer” in the “optional tags”).