I installed Construct 2 through Steam, then bought a license on the Scirra site. How do I apply the license to my Steam install?
I don't think you do - I suggest you just download the latest build from the bottom of this page, install and follow the licence instructions. I would remove local file from steam first though.
Steam and non-Steam licenses are different, you can't buy from Scirra and apply it to your Steam copy I'm afraid.
Most users prefer the non-steam version though as it gives them more freedom.
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Will do, thanks!