Recently, I start the L4D2 and my add-ons are start to reinstalling. But I installed all of my add-ons since last time, I think it is about 3 months that I installed all of it. I'm so confused that my add-ons after waiting 6 hours to finished the reinstalled add-ons are incomplete! Most of them are my add-on maps like Back To School, RedemptionII, DayBreak, and I Hate Mountains. Why did this happen? Is this from may L4D2 or the STEAM has the error?