Any link in earthcam is unable to play. Been this way since osmc krypton. Also did updated krypton and earthcam that came out the other day.
A quick google didn’t revealed any compatibility between the Addon and Krypton.
So you might want to catch up with the addon developer on their Krypton plans.
Furthermore as this addon is not part of the official Kodi Addons please don’t expect support from OSMC or Kodi team.