HL2 questions please!

[GMLP]

I got all 3 Half Life 2 games (non-Steam) as part of the Orange box. As far as I know Valve has released a number of bug fixes for these games through Steam Update process, including the Source Engine bug that crashes the game in HL2: Episode 2 at certain point of gameplay. So:
1/ How can I obtain those bug fixes to patch my games not through Steam?
2/ Besides, HL2: Lost Coast is bundled in the Orange box, but I've completed HL2 and couldn't find this level. How can I get access to it?
3/ I got some weapon and character skins/mods (in materials and models folders), but all resources for the games are packed in GCF files which cannot be altered. I also tried putting these mods using the same paths as in GCF files to no avail. How do I apply the mods?

Thanks in advance!

 

[Jake]

You have to download newer GCFs from the GCF section.
HL2:Lost Coast is a standalone game ( one map lol)
To install skins:
EX:If you downloaded a weapon model+skin,you put it here
CS:S:Model: \steamapps\acc name here\counter-strike source\cstrike\models\weapons
Material(skin): steamapps\acc name here\counter-strike source\cstrike\materials\models\weapons\v_models OR W_MODELS IF IT HAS WORLD MODELS

BUT,most likely every author puts an instruction with the skin
Also if you see cstrike or models and materials don't panic...for example replace the
Cstrike with the one here:
steamapps\abiliider\counter-strike source

Tell me if you understood that lol.