The most secure way to obtain the software is through the Pro-face Knowledge Base or by contacting Schneider Electric technical support.
Pro-face sometimes provides a 4-day trial version of QuickDesigner 3.7. Digital QuickDesigner Trial: Schneider Electric Box Link. Service Pack 4 Update: Pro-face Download Center .
Because QuickDesigner is legacy software, finding a legitimate download requires looking into official archives and verified community repositories: