You only can use 1 at the same time. They pretty much do the same thing but with Crash Fixes it gives an error message explaining the CTD which I do not think SSME does which is why I use Crash Fixes. https://www.nexusmods.com/skyrim/mods/72725/? Just follow the installation instructions and you should be fine. It also gives some tips on what you can do for further stability. Thanks, im trying to get these mods to work: https://www.youtube.com/watch?v=M47Fq38anUM but i seem to crash, could you help me? Also, my problem might of been that i was using both, thanks.