cheatachu72Sep 2, 2022Half-LifePortal 2 Authoring Tools has the old Steam layout... even though it was already outdated when Portal 2 released108
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this version of vgui2 is also older as it has a minimize button which was present on early counter-strike 1.6 builds
where to find this
click the games and soundtrack button and press tools I think it should be there
SDK does not have to look modern, for developer making good looking SDK is a lose of time.