Re: How to install mods for 1.70 64 bit Mac?

@royaleagle_sun  Your screenshots show the game itself, as in, what the EA App installs.  Mods go into the Sims 3 user folder, in Documents > Electronic Arts.  This is the same as in Windows.

I don't know what tutorials you're reading, but it's possible they cover other types of game tweaks: not standard mods exactly but rather modifications to the game data.  That would be a different matter.