Hi There,
To anyone following this thread the version of @thomas_pronk demo that is maintained by the team has now been updated to function in PsychoPy version 2021.2.3. There were some changes between version 2021.1.4 and 2021.2 which may mean the original version will not work in later releases (downloadResources changed to prepareResources)
You can find the updated demo here: demos / demo_eye_tracking2 · GitLab
Becca