That was the "The Witcher Goodies Collection".
The Spring Sale Goodies Collection #1 had the following:
Darkest Dungeon wallpapers (15) 19 MB
Obduction wallpapers (3) 11 MB
Unforeseen Incidents original soundtrack 167 MB
Darkest Dungeon avatars (9) 1 MB
A Plague Tale: Innocence artbook 253 MB
GreedFall artbook 26 MB
Styx: Shards of Darkness artbook 18 MB
The Surge artbook 36 MB
The Surge 2 artbook 28 MB
Vampyr artbook 17 MB
Unforeseen Incidents artbook 45 MB
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Claim from the Main GOG Page.
Spring Sale Goodies Collection #2
Available until 29-March-2020, 13:00 GMT.
Contents:
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