Everything about the beta launcher belongs here:
https://github.com/Slowpoke101/FTBLaunch
or on the IRC channel #ftblauncher on Espernet
it doesn't really belong on the forums....Though if you know how to install mods you can install the mod pack.
They are currently working on updating the launcher so that it works properly.....the hole point of working on anything I guess , is to make sure it works properly or to improve on it.
The beta launcher doesn't work very well at this point. It will work great in the future though.
Try to delete the folder where it downloads file, then relaunch and try again. There are still some problem in downloading mods but try 1 or 2 time and it should work fine. It works for me ^^
hope it helps
open the mods in the instMods folder and copy them to the minecraft.jar
the .minecraft folder is just copied over directly. the folder structure is already setup right in it.
might want to delete a folder in the minecraft.jar...can't remember which on though...
Note:
If you don't have experience with mods just leave trying anything on your own alone....unless you want a learning experience.