Hopefully you have the original game as well since the DLCs were designed for adding to the original GTA IV...at least that's how I THINK it works lol.
Life is what happens while you're making other plans - taken from the movie "Kuffs"
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"Who is more foolish...the fool or the fool that follows him?" - Obi Wan Kenobi
The hurrier I go, the behinder I get.