There is Mac OS and Linux version available on Steam (https://store.steampowered.com/app/722920/Hex_Empire_3/). With every purchase on itch.io you receive a key to download any version on Steam platform, or you can just buy on steam. Multiplayer is in development!
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You can edit maps you created by pressing "Browse" button in the Editor launcher menu, just as you select a map to play in the Squirmish menu. There will be map sharing added through the Steam platform (you can claim your Steam key on itch.io, as you bought it).
Yes, I made HexEmpire 2 for come2play, I see they apparently still exist, but changed profile. I own client for the game but they owned the server side, so it can't be run anymore.
I probably have sources for the games somewhere on old hard drives.
The bug is fixed in the latest update.
Hex Empire 2 was a flash multiplayer game that I made for apparently defunct company, so the servers are off and the game is no longer available. Hex Empire 3 is much much better :).