From the official announcement post:

Hey everyone! As much as I hate posting such information, we have an upcoming delisting.

Per the publisher's request both The Suffering (https://www.gog.com/game/the_suffering) and The Suffering: Ties That Bind (https://www.gog.com/game/the_suffering_ties_that_bind) will leave our store on September 1st (no exact hour yet).

Grab the game before that if you're interested. And as always, I'm sorry to be the bearer of bad news.