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As soon as they update mods on their side, you get a message about mod pack update with a launch. It will redownload the whole mod pack.
But nothing stops you from updating your mods or adding new by yourself anytime.
i think you mean the thermal expansion? this wont update on his own, the ftb staff has to update manually the ftb modpack and release it, once this is done, the launcher will grab the updated modpack.
The launcher could include this by installing harnesses into the .jar itself for Minecraft, but it would be difficult to implement (it'd have to communicate with many different mods' systems simultaneously) and likely not worth the effort/time/system resources.
I don't know if its that drastic, when they all use FML to load properly. The FTB folks have alot of sway with FML and these mod loaders and could suggest a unified update checks to run through a module of FML or of their own making, which could then be disabled the same way vanilla elements are disabled/overwritten to use the mods.
You updated the launcher and when I hit the "Yes" Button to update, the launcher quit and nothing happened. I manually downloaded it, but is this normal?