DELISTING: SpaceEngine and its DLCs, page 1 - Forum - GOG.com
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From the announcement post:

Hello everyone, unfortunately, we’ll be removing SpaceEngine and its DLCs from the store.

The delisting will happen on: November 22th, 2024, at 2 PM UTC.

No chance of a last-minute discount. We’ll try to bring it back, maybe when the game receives the full release.

Sorry to be the bearer of bad news.