I have a similar problem, although I dont have my skyrim through steam. The current release of SKSE (1.6.16) requires runtime 1.9.32.0, but mine is 1.7.7.0. How do I update my Skyrim without steam support? I would just find the SKSE that works for my runtime but a bunch of mods that I want to use say they require 1.6.16 or newer for SKSE.