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Any ideas what that installer does...? Presumably I got it because I pre-ordered the game, but I don't think this installer was mentioned anywhere.
I hate to be that guy, but is yet another inquiry on that matter really necessary?

https://www.gog.com/forum/phantom_doctrine/phantom_doctrine_official_patch_notes/post15
https://www.gog.com/forum/phantom_doctrine/deluxe_edition_upgrade/post1

There's a search function to the top right.
Use it, please.