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a notification to sign into epic games popped up and asked me to sign in when starting this game after the update. i don't even have epic games installed...
This question / problem has been solved by SentimentalWooshimage
I believe it's used for the online servers when playing multiplayer because the game is made in Unreal Engine. If you want to remove the notification I made a community post here:

https://www.gog.com/forum/spongebob_squarepants_battle_for_bikini_bottom_rehydrated/how_to_remove_press_f4_to_sign_in_epic_games_popup