Cracked Minecraft Launcher 1.6.48
New Launcher Features - Offline Mode, Ability to play in offline mode when download servers is down or updating (Only works if your client is already downloaded) - Fully MD5, Well on the old launcher the updater had a chance to skip or 'think' that the files is up to date but their really not up to date. Torrent Aerosmith Crazy. This was the main cause of ID conflicts, mods missing and outdated mods.
With the launcher fully MD5 these problems is solved by tracking the hash(fingerprints) of the files itself. - Mod Sync Mechanism, This is a very sensitive implementation to launcher as it is working with your mods folder to make 100% sure that the mods you have is the correct ones and it will remove any mods that is not sync'able. So you wont be able to add any mod.