I already have the Hebcalendar for 2018 and 2019. I want to download the iCalendar or Google Calendar for 2020-2021 but the 2021 calendar doesn't cover all of 2021 and goes back all the way to January 2019.

I've found it only works if you click "add calendar" and then click "From URL" and use the iCalendar URL.

Google Calendar stopped using ics documents