randomxxx wrote:orange box sdk
There is no such thing as orange box sdk. There is just Source SDK for both episode one and orange box engine branches. And you should be able to see it in tools category.
There is also SDKs named 'Left 4 Dead Authoring Tools', 'Left 4 Dead 2 Authoring Tools', 'Alien Swarm - SDK' and 'Portal 2 Authoring Tools' for those who own those games (and corresponding branch of Source engine).
FriedchikenCamo wrote:randomxxx wrote:but does f2p tf2 grants a user free source SDK as well? I heard it does, but I don't see orange box sdk in downloadables.
As of now it doesn't, unless you buy an item in the TF2 store.
Source SDK isn't required to play NT°:S. Source SDK Base 2006, which contains materials, models, sounds and binaries (it's basically a copy of Source engine protocol v7) is required. Source SDK is required when you want to create a new mod, not to play existing.
Nevertheless, both Source SDK, Source SDK Base 2006 and Source SDK Base 2007 are free for download now. Regardless if you bought something or not. Move your steamapps folder out of steam folder temporary, create a new Steam account and check for yourself.