Final Cut Pro X

An application was installed on Petronella Osgood's computer by 10 May 2020. Its logo was a clapperboard with a colour wheel in its centre. (WC: The Zygon Isolation)

Behind the scenes
While the application was not named in WC: The Zygon Isolation, the application was named "Final Cut Pro X", in the real world, and was a professional non-linear video editing software.