If you are unable to open Adobe InDesign 2021 because you get this error:
You are using an incompatible version of Typefi Designer and InDesign 2021. Typefi Designer 8.7.2 is only compatible with InDesign 2021 16.3 or later.
To use Typefi Designer 8.7.2 with InDesign 2021, upgrade to InDesign 16.3 or later. If you use InDesign 2021 16.0–16.2, downgrade to Typefi Designer 8.7.1.