DELISTING: Hellish Quart, page 2 - Forum - GOG.com
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From the announcement post:

We’d like to inform you that due to the publisher’s request, Hellish Quart will be delisted from our catalog on Thursday, February 15th, 6 PM UTC.

For everyone who purchased this title prior to the delisting, it will remain in their GOG library. Additionally, the Publisher informed us that the game will continue receiving updates to retain parity with versions from other storefronts.