How do I update my modpack?

[GravityTnt]

How do I update my pack? In the Official modpacks (Hexxit, Yogbox, Attack of the B-Team, e.t.c) and in other common modpacks they have builds such as 1.0.3, in the modpack editing screen you have an update feature. I but when I went to the launcher it didn't have the option of switching back to the earlier build. How do I have multiple versions/versions of my pack?

Edited August 8, 2014 by GravityTnt

[plowmanplow]

That feature would require the use of the Solder API: https://github.com/TechnicPack/TechnicSolder

 

The Solder API has essentially no support at all. If that page does not have all the information you need to get it working then you should probably not use it.