PC Help accessing older version

Brightlance

Newcomer
My two children wanted to play multiplayer with each other again due to the global stay-at-home; however we previously did this last year when both my Mac client (GOG) and Windows client (Steam) were on the same version (1.4.2)

However our Mac isn't compatible with the version of MacOS that the current version (1.4.5) runs and I can find no way to revert my Steam version to an older release. Is there any way we can get access to an older Windows client (1.4.2) so the kids can get back to enjoying this delightful game.
 
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