Hello...
i buy construct 2 personal edition for steam, buy from my friend then gift to my steam account.
i've click redeem gift and steam notice "already in your library", i check library and click activate, but the page is redirect to pending gift.
please check this video.
https://drive.google.com/file/d/1MGVNbHU7_hVToMPNkvRNugUNVjpR2WW6/view?usp=sharing
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This is a Steam issue as licensing for Steam purchases is handled by them and not by this website.