I don't know where post this, sorry if I missed with forum.
After one of recent updates my personal version downgraded to free.
But in my library i still see that I have personal license
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It happened to me as well, simply uninstall both versions in steam (Free and Personal) and reinstall the Personal.
Always run Construct2 through Steam and never with the EXE.
Please do not post license issues as bugs; you will need to contact Steam about this, since the Steam version of Construct 2 asks Steam for the licensing information and the service is run by Valve, so we can't offer any help with that.