Open the other calendars panel, click '+' and choose "From URL".
Paste your calendar URL in the text field and hit "Add Calendar" ( https://ics.calendarlabs.com/499/f5471edb/Saint_Vincent_And_The_Grenadines_Holidays.ics
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Your are now subscribed to the calendar. It may takes a few minutes for the events to show up.
Your Calendar is Ready
(Click "Add to calendar" to subscribe)
Automatic subscription works, when the 'Calendar' application is your default calendar.
Open the 'file' menu, and choose New Calendar Subscription.
Paste the calendar url in the text field and hit Subscribe( https://ics.calendarlabs.com/499/f5471edb/Saint_Vincent_And_The_Grenadines_Holidays.ics
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Adjust the calendar settings.
Make sure the auto-refresh option is checked, in order to keep te calendar up to date!
Click OK to finish the subscription process.
Open Outlook app in your desktop
Right Click on My Calendars (on your left panel)
Select "Add Calendar" > "From Internet..."
Paste the webcal url in subscription popup( https://ics.calendarlabs.com/499/f5471edb/Saint_Vincent_And_The_Grenadines_Holidays.ics
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Click "Yes" to confirm
You can see calendar on your left panel My Calendars section
Confirm to add the calendar subscription. It will keep itself up to date.