calendars aren't showing (iCloud and gmail accounts)

I’m considering switching to eM Client from Outlook but my calendars didn’t populate (from iCloud and gmail) and I am getting authentication errors after my accounts were set up. My emails are coming through, but before I pay for something I need to be sure that calendars will work. Any ideas on how I can get this fixed easily?

If you are using one of the latest versions of eM Client, uninstall that and then download 7.2.35595 from the Release History. See if there is any difference.