You can't. Unfortunately, the .gcf files are not enough. Someone would have to rip every single model and reverse engineer them for hl2 non-episodic, and nobody is going to do that. The only way to solve this is to have the Episode 2 or wait for someone to do that, or do it yourself to the models of your liking.
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Half-Life, Half-Life: Blueshift, Half-life: Opposing Force, Half-life: High Definition pack (might not classify as a game), Half-Life: Source, Half-Life 2, Half-Life 2: Episode 1, and Half-Life 2: Episode 2. Eight games total not including countless mods created by fans that you can download for free on moddb.com and fileplanet.com. Other games by Valve software include Left 4 Dead, Left 4 Dead 2, Portal, Portal 2, Counter Strike, Counter Strike: Source, Team Fortress, Team Fortress 2, and Alien Swarm. Another Half-Life game would be Half-Life: Decay. You might also be able to count Half-Life Deathmatch and Half-Life 2 Deathmatch.
Half-Life 2: Episode Two was supposed to be released on October 9 2007 for Xbox360, Playstation 3 and PC. The development team that worked on Half-Life 2: Episode One was working simultaneously with the team that worked on Half-Life 2: Episode Two so when they were using the same program to develop it, they could fix any bugs that were to appear on each other's progress. Half-Life 2: Episode Two was released for PC and Xbox 360 on October 9 2007 as Valve anounced, but the team that was working on the game for Playstation 3 was working in the UK so they had some issues communicating with the other teams in the US, and so, the release for Half-Life 2: Episode Two for Playstation 3 was delayed a few more months than it should have.
Towards the end of the game
Half -life 2 has not been realsed for free. altough you could torrent it for free using U-torrent or bit torront.
Any Source game. This includes: Half-Life 2 (You pretty much get stuff from this in any Source game) Half-Life 2: Episode 1 Half-Life 2: Episode 2 Team Fortress 2 Portal Counter-Strike: Source Day of Defeat: Source Get any 2 or more of these and you should be set to go, but I really honestly suggest getting all of them, its only about $50 (if you get the $30 Orange Box, which contains all Half-Life 2 games, Portal, and Team Fortress 2, then get CS:S for $20) Alternatively, Team Fortress 2 is now Free-to-Play and downloading that will allow you to play Gary's Mod, or any other Source mod!