...from Slickdeals:
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Deadlight: Director's Cut (PC Digital Download) for Free (if you currently own a Deep Silver Game or purchase one from $0.99)
https://www.gog.com/game/deadlight_directors_cut
Add it to the cart and it will be $0.00.
Update: Turns out this is free if you own any Deep Silver game. If you got Wasteland, Metro: Last Light Redux (previous FP) for free, then it should be free.
Deep Silver Games [gog.com] from $0.99
https://slickdeals.net/f/14906540-deadlight-director-s-cut-pc-digital-download-for-free-if-you-currently-own-a-deep-silver-game-or-purchase-one-from-0-99?src=frontpage&v=1
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Add the game to the cart and claim a complimentary copy of Deadlight: Director's Cut if you own or buy any Deep Silver game during this publisher sale.
The offer is valid until 22nd March 2021, 2 PM UTC.
I own Wasteland on GOG, so this worked for me. O0