Trying to use the launcher for the first time, 151 files all receive a 404 response. Many of them are game assets, but there are also a number of libraries that fail to download. I poked around in the GameFiles/ subdirectories that the launcher is trying to download from and noticed that the ones under objects/ only go as high as e0/ and that there is no libraries/ subdirectory. It also gets a 404 response for the libraries from the fallback at libraries.minecraft.net. Hopefully you can sort this out, but I'll check the Technic version and see if that works. Edit: The Technic version also doesn't work. It says "Failed to download http://www.cyberconnects2.com/games/updates/rcraft/ammp_24-5-2016.zip".