While the now-obsoleted L4D2 SFM Compatibility Pack fixed most of L4D2's maps, it didn't fix all of them and it ignored the DLC. This takes care of the DLC maps and fills in a couple of the gaps.
You'll need the official Left 4 Dead content pack for SFM to use this.
Current Contents: Dead Center: The Mall, Dark Carnival: The Rollercoaster, All of The Passing and The Sacrifice.
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