In the product selection menus, choose "Audio", followed by "Notation & Scoring" -> "Sibelius" -> "Sibelius" -> "4.0".
Click "Submit My Question", fill in the additional fields required, then "Send". Your case will not have been submitted until you have completed, and clicked "Send".
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Sibelius 2021.2/7.5.1/7.1.3/6.2/5.2.5, PhotoScore Ult 2020.1, Windows 10 64-bit 16GB. Desktop, and Microsoft Surface Book.