How to subscribe with iCloud Calendars

First, you need set the iCloud calendars to public.

1. Open icloud.com in a web browser and go to your calendars.
2. Click on the circular 'wireless' icon to the right of the name of the calendar you want to use.
3. The calendar you want to use must be shared. If it's not, you'll be presented with the option there.
4. Once the calendar is shared, copy the sharing link.

Next, open Desktop iCalendar and follow next steps.

1. Right click the calendar window and select "Manage Calendars...".
2. Click "New..." button.
3. Select "webCal and other web calendars(Readonly)" and click "Next" button.
4. Paste the link to the textbox and follow the instructions of the wizard.