Downloaded but won't open. Told me new version. What do I do?

I really liked this map how it was, and the new edition definitely improved upon the original. The new dialogue makes the map feel complete, and many of the empty walls have been furbished quite well. I especially liked how the miniature hold-out in the second map was shortened for a better experience. However, I still had a few hang-ups with the new version. The first was that on the first map, the section where you needed to jump across the alleyway still had some ledges where you could hang even though a fall wouldn't have occurred. The second was when it came to the rebalancing of the of weapons. I felt like the only changes that were made was the removal of previously existing weapons and items, which felt mostly unnecessary. The third thing was the new finale. While it also fixes the exploit of being able to skip the second tank and run to safety, the new elevator finale basically cuts the already short map in half, while the finale area itself isn't balanced properly to hold a finale. Meaning you can very easily circle-camp infected, or even run back into the saferoom if you like. I thought maybe the elevator could open, and survivors could continue through the old hallway with the finale still going, so as to be a sort of gauntlet like in The Parish. Just some thoughts on, I still really like this campaign as it was one of my favorites to play. Also, why remove Versus support?

Nice to see the elevator event is now a real finale, but I think you could've kept the running through the basement part afterwards as a run-to-the-chopper finish. Half the stats in the credit roll show 0's too. Also, I can still scum out most of the finale by hiding in the safe room. :P (at least until the 2nd Tank spawns)

What's with the last map? Next to the elevator there is a radio station. When I click on it, nothing happens. The arrow towards the elevator, but this one remains dead. I ran for an hour and nothing happens. There is no way out.