Ok, so I know where the Curse Minecraft folder is, and inside of it are 3 folders: Downloads, Install, and Instances. The only launcher.jar file I've managed to find is inside Install, but when I open that with Java Platform SE Binary, I get the vanilla minecraft launcher that's from my .minecraft file. Inside the instances folder are the modpacks I've downloaded through Curse, but I cannot find a launcher.jar inside any of those. Inside the modpack foolders are all the normal files and folders you'd find in a .minecraft folder, execpt the Minecraft launcher. Instead of that there are two json files, manifest.json and minecraftinstance.json, and an item called .curseclient .