Normally Not, not necessarily, but as the project is very young there have been many changes but I hope it is rather not too bad But it is a good stuff to get the latest improvements. I have to publish a new version with all the fixes and improvements, but each time, a new thing comes, like MountPEmedia, check RTM version and I wishes it as stable as possible. I hope to do it really soon. You are right on Update WinPE SE (Exact and Secure) it was not there at the beginning. There have been many changes indeed, also due to a complete rewrite of the macro library by Lancelot, more stable, compatible PE1,2,.,4 and with a lot of usefull new macro. Transparent for users and really useful for developers.