Hi Dragan,
I sent my reply yesterday but could not hear anything back from you:
I’ve followed each link and was able to download a valid ICS file, however, there are no bookings in any of the downloaded files. There is nothing to export from your site by using the links you provided. Please add at least one reservation to each accommodation and then test if the bookings can be imported to the third-party calendars.
Please check your inbox or spam folders and send a reply if this does not help.