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. UI.X Classic 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 ClassicFreeUIX2 if you have UI.X 2 and ClassicFreeUIX2Dark if you have UI.X 2 Dark. See UI.X 2 for coupons as well if coming from XenForo 1.