I think they're referring to the install button in the itch application to download and install the game. I had that issue as well with this and with other games stored on Google drive. Downloading through the web page should work.
A member registered Aug 13, 2015FollowFollowingUnfollow
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itch.io Community » itch.io » itch app Development · Posted in Itch app gives a Certificate error on startup, can only close the app