Now I may be wrong, but the way I see it, MS release TH2 and these updated versions as previews to a Service Pack for Windows 10 RTM. What I do not understand is why they aren't releasing updates that would bring 10240 RTM version to those later TH2 builds? Is it because they are BETA builds? Is there any way to UPGRADE to those new builds from 10240 ROM build without having to perform a fresh install? I hope eventually it needs to be done - it makes no sense to release a brand new version of Windows 10.1 (or whichever version) that requires people to do a fresh install.