Export ICloud calendar to .ical file

I need an .ical file for my one public calendar.

This doesn't work:

To export iCloud calendar do the following:

1. Open iCloud Calendar.
2. Publicly share a calendar.
3. Select and copy web address from this public calendar and paste it to your browser.
4. Change copied address so it begins with http instead of webcal and press Enter.
5. Then iCal file should be downloaded to your computer.

When I change "webcal" with "http" it automaticly changes to "https" and nothing happens. Tried this in chrome, explorer and edge. Nothing..

Is there any other way to get the calendar as an .ical file?

Kind regards,

Caroline