UPDATE 20/10/21: Square Enix has now confirmed the PC file size of Guardians of the Galaxy will be "approximately 80GB at launch". The system requirements on the Steam page have been updated accordingly.
The news was shared in a tweet, with replies confirming that the PS4 and PS5 versions of the game will require around 50GB of storage. There's no official word yet on the Xbox version.
ORIGINAL STORY 18/10/21: