installer.nsh

!macro customInstall
  NSISdl::download https://aka.ms/vs/17/release/vc_redist.x64.exe "$INSTDIR\vc_redist.x64.exe"  
  
  ${If} ${FileExists} `$INSTDIR\vc_redist.x64.exe`
    ExecWait '$INSTDIR\vc_redist.x64.exe /passive /norestart' $1

    ${If} $1 != '0' 
      ${If} $1 != '3010'
        MessageBox MB_OK|MB_ICONEXCLAMATION 'WARNING: Streamlabs was unable to install the latest Visual C++ Redistributable package from Microsoft.'
      ${EndIf}
    ${EndIf}

    # ${If} $1 == '3010'
    #     MessageBox MB_OK|MB_ICONEXCLAMATION 'You must restart your computer to complete the installation.'
    # ${EndIf}

  ${Else}
      MessageBox MB_OK|MB_ICONEXCLAMATION 'WARNING: Streamlabs was unable to download the latest Visual C++ Redistributable package from Microsoft.'
  ${EndIf}

  FileOpen $0 "$INSTDIR\installername" w
  FileWrite $0 $EXEFILE
  FileClose $0
!macroend