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If downloading the game for mac you may need to do a couple extra steps to get the game to run because mac's gatekeeper will block the app.

Mac Instructions:

https://houseinwoodsgames.com/update/game-not-downloading-or-running-on-mac-osx

Temporarily disable Gatekeeper settings to allow unidentified applications to be downloaded

Select Apple > System Preferences and under the Personal section, select Security and Privacy.

In the Security and Privacy pane, click Lock on the bottom-left and enter your Mac OS X username and password (local user account).

>Click Unlock.

Select the radio button next to Anywhere, under the Allow applications downloaded from section and then click Allow from Anywhere.

You can now install the application for your Mac without it being blocked.

NOTE: Reconfigure the Gatekeeper settings once you have completed updating or installing your required applications.

Use Unarchiver to unzip the zip file on mac: https://theunarchiver.com/