Who plays Jermaine Andrews in Grand Theft Auto IV

Yes, it is different.

Episodes from Liberty City only contains the expansions Ballad of Gay Tony + Lost & Damned. It does not contain the storyline from the original GTA IV. I would assume the size is so large because it includes most everything from the original game. The Xbox 360 expansions both weigh in at 2GB+ by themselves. The expansions make use of most of the entire city and have all the same vehicles, guns plus more.

I recommend verifying the game cache.. Its possible you are missing files.

To verify cache, right click the steam game in the list, properties, Local files tab and find the verify cache button. Click it and wait till it finishes.

It will download any corrupted/missing files.

As for the other stuff, it was too long ago to remember.