Now in Mac App Store as well as Lantern Chess - ICC Online.
Mac Signed Installer: LanternMacCatalyst1.0v.dmg 11 Megs
Lantern Chess - ICC Online Mac Catalyst App let's users connect to play on the Internet Chess Club as a member or guest. Members can also watch games, participate in tournaments, chat in channels, watch chess instruction videos in-app, as well as other features.
Lantern Mac Catalyst App saves played games and keeps PGN at ~/Library/Containers/lanternfirst.Lantern-Chess/Data/Documents/ Game collections such as the users log file can be coppied out and PGN game files can be placed in here to Open within the App.