You can still download the original FTB launcher, which I will use until it no longer works.
It's much better at being an MC modpack launcher than the Curse Client was when it began (or the Curse Launcher - before the Curse Client).
I honestly don't see the need for all the crap that is in the Curse Client, such as the VOIP/Skype integration. There's no need for it IMO. I like the fact you can create your mod pack in it, but that's about it. Using the vanilla MC launcher (which is crap BTW, it never remembers my login details) is a stupid idea too... So, it's any other MC launcher or MultiMC. Curse Client looks nice, but is crap for MC. Every other "decent" launcher (apart from the technic launcher, from what I've seen) is very lacklustre it its appearance, but perfect for it's job (launching a mod pack)