I fixed it. (Yes I am in windows 10). The problem was Curse was not updated. To update it you got to "help", "about Curse", then "Switch to Alpha". Then Curse should update, letting you play your modpacks.
The problem I have is that, in the new launcher; I try to run the pack (yes it is installed using the curse client and correctly) and it stops at "preparing" in the download of files in the new launcher. I have a screenshot and after it is minimized, the launcher will go all black except int the top right corner, where the launcher is tiny. Also, this does not happen in vanilla.