That last error seems like a problem with your download:
The Forge download servers are often quite slow due to heavy load. The error itself suggest to try again, that's probably the best advice in this case. It's not a bug in the mod pack or the launcher. Just a failed download which is something completely out of our control.2013-10-01 17:42:58 [SEVERE] [ForgeModLoader] Error details
java.lang.RuntimeException: The downloaded file scala-library.jar has an invalid checksum 18c91f848b2425843d33dbaa535bc285c7c3ab20 (expecting 458d046151ad179c85429ed7420ffb1eaf6ddf85). The download did not succeed correctly and the file has been deleted. Please try launching again.
As for the mods in the RPG pack not being up-to-date. I'm currently considering what to do with the RPG pack project- and people-wise. Marius has been taken of the project so now I'm talking to people to see who has interest in continuing the mod pack.
Once we're sure what we want to do with the RPG pack, new updates and fixes should appear soon. Currently it's very unstable and frankly it shouldn't have been released.