Are you on a somewhat modern version of Microsoft Windows (10/11)?
If so after downloading the game from the main page:
Right click and extract Starmaker_Story_1_7_FullGame.zip in your Downloads folder
This should create a Downloads\Starmaker_Story_1_7_FullGame\Starmaker Story 1.7 folder
In the Downloads\Starmaker_Story_1_7_FullGame\Starmaker Story 1.7 folder double click the Starmaker Story.exe
If that does not resolve the issue, let us know any further details e.g. Machine specs and any error messages?