UI.X for XenForo 1 was the original flagship product from ThemeHouse/Audentio. Though the look and feel was modernized in UI.X 2, we decided to use the same colors, fonts, and general look and feel as it was back in XenForo 1 for a dark version. UI.X Classic Dark has been updated with the UI.X 2 Framework, which comes with tons of new features. There may be some features it does not have perfect parity with, but many are indeed planned. This is a free product with any purchase of UI.X 2 for XenForo 2 with an active license. Use coupon code ClassicDarkFreeUIX2 if you have UI.X 2 and ClassicDarkFreeUIX2Dark if you have UI.X 2 Dark. See UI.X 2for coupons as well if coming from XenForo 1.