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Launch Portal 2, open the Developer's Console, type 'snd_rebuildaudiocache' (sans quotes), and press Enter.21. Open the 'portal' folder there, then 'maps', and paste the files, but don't replace anything.20. Browse to the steamapps\common\Portal 2 folder.19. Open the 'portal' folder, then copy everything inside 'maps'.18. Open up Windows Explorer and browse to your steamapps\common\Portal folder.17. You can close the Portal 2 Authoring Tools now. In Face Maker, click File>Rebuild scenes.image. Open the Portal 2 Authoring Tools, and double-click on Face Maker.15. Extract everything except 'resources' into a new folder called 'portal' inside the steamapps\common\Portal 2 folder.14. Go back to File>Open, go back to steamapps\common\Portal, then open the 'portal' folder inside, then the portal_pak_dir.vpk file.13. Repeat for hl2_sound_misc_dir.vpk and hl2_sound_vo_english_dir.vpk (if you speak another language, extract the hl2_sound_vo_dir.vpk file as well)12. Extract everything in that into the hl2 folder.11. Click File>Open and open the file hl2_misc_dir.vpk10. Click Make New Folder, then type hl2 and press Enter.8. Choose Extract and in the dialogue box, browse to your steamapps\common\Portal 2 folder. In the right-hand-side pane, right click on 'materials'.6. Go into the hl2 folder, and open the file hl2_textures_dir.vpk5. Open GCFScape, click File>Open and browse to your steamapps\common\Portal folder.4. Install the latest version of GCFScape from this link:. Make sure you have Portal, Portal 2, and the Portal 2 Authoring Tools installed and updated on Steam.2. To install Portal on the Portal 2 engine:1. If you want to play online, delete the "hl2" and "portal" folders from your Portal 2 folder, then verify your game cache. EDIT: I wouldn't recommend playing your copy of Portal 2 online after doing this, though - it might trigger VAC. I'm not responsible for anything else bad that happens, either, but I don't see how anything else bad could happen. I recommend that you have a backup of your Portal 2 folder, especially your save file, before you follow this tutorial. Please note that I am not responsible for any damage to your Portal 2 files caused by performing these instructions. You do get a few reskinned models and replaced textures playing the game like this, but the problems outweigh the questionable improvements.
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Better yet, there are absolutely NO objective graphical enhancements in Portal: Source 2!Seriously, though, this is best as an experiment. If you liked Half-Life: Source, then you'll LOVE Portal: Source 2, the port which gives HL:S a run for its money in terms of functionality broken from the original game.
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