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Use AutoIt or AutoHotkey for more robust silent installs. Example AutoIt snippet:

:: License -> Next mshta "javascript:var s=new ActiveXObject('WScript.Shell'); s.AppActivate('Format Factory Setup'); s.SendKeys('ENTER'); close();" timeout /t 2 /nobreak

:: Welcome mshta "javascript:var s=new ActiveXObject('WScript.Shell'); s.AppActivate('Format Factory Setup'); s.SendKeys('ENTER'); close();" timeout /t 2 /nobreak

:: Launch installer minimized start /min %installer%

:: Finish: uncheck "Run Format Factory" then Finish mshta "javascript:var s=new ActiveXObject('WScript.Shell'); s.AppActivate('Format Factory Setup'); s.SendKeys('SPACEENTER'); close();"