I have had VIRB Edit 5.3 installed and working for a number of years.
Recorded first videos of the year and went to edit with the linked 2 camera edit.
With 5.3 installed it gets shut down with the instruction that there is a later version available.
When I download the current 5.4.3 and attempt to create a video, after bringing the raw files into the editor - IT CRASHES.
NO JOY!