Actually, I don't know if it's the MAC part that's the problem when it comes to texture packs.
I tried to download DBcraft texture pack (http://bdcraft.net/download-purebdcraft-texturepack-for-minecraft) to my tekkit's save. I used Minecraft HD Patcher (http://www.minecraftforum.net/topic/232701-12w25a-125update-616-mcpatcher-hd-fix-237-02/) on my tekkit's Minecraft.jar, but encounter a problem myself.
Entering the game works all nice and dandy, but when I try to select the texture pack, the game menu vanishes, freezes for ~ 15 seconds, before just turning white and forcing me to Alt+F4. It shouldn't be a problem with my computer as I am 100% sure it can handle the texture resolution.
All though in his case, I might be wrong. But the information Sparky gave was really, really vague to be honest.
Edit: Just saw him write that the texture button did nothing at all for him, so ignore what I wrote up there.
I'm still fairly new to Technic, so I am probably doing something wrong, heads up would be nice in that case.
