Just started playing and enjoying it so far! Just wanted to mention that there is no information regarding the platform on this page. (FYI, I am playing it on a Mac using ScummVM and so far haven't had any problems.)
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Hi, the download is a zip-File. You can unpack it and the resulting folder has all the relevant files. Then you just need to point ScummVM to the folder ("Add Game"). ScummVM will (currently) report that the game is an "unknown game variant", but will allow it to add it (click "add anyway"). Then you can rename it from ags-fallback to the correct title. Worked for me and I managed to complete the game this way.