You can get to the recording of the webinar using the same link as you used to get to webinar itself:
https://event.on24.com/wcc/r/1595760/1EB0799BEEE34400AA1E1CF0EEE39A04?mode=login
If you use the link in your invite, you don't have to register again as it will contain your email.
I have also attached the slides from the webinar "Moving up to MapInfo Pro v17.0 from previous versions - why and how?"