You cannot downgrade the browser version of minecraft.
download the Minecraft Version Changer
Google: "minecraft server 1.2.3 download" :D
MCdowngrader
Currently, minecraft is at the version 1.4.5. Look for any tutorial videos online how to downgrade Minecraft.
142 is the median.
Use this link. It helped me a lot! After lots of videos this is the only thing that worked for me.
If you, by downgrading, mean changing to an older version, then no, you can't. wrong! You can you must have a backup/copy of the old .minecraft in your roaming appdata folder. just take old one and put in there In fact... there is an easier process There is a tool called MCNostalgia which can downgrade your versions of Minecraft. For example, if you don't like some new update (and I kinda do), you can downgrade Minecraft to that version. It currently supports all the way back to Indev (February 2010).
142-144°c
There is a program called Minecraft time machine (or something like that). Download that, and you can downgrade/upgrade Minecraft. You'll need a legal version (you paid for it) of Minecraft for it to work.
Index finger finger print ridges:Males: 142-146Females: 123-124Mean total is 144 and 124Index finger finger print ridges:Males: 142-146Females: 123-124Mean total is 144 and 124
There are two ways to downgrade Minecraft:use MultiMC and simply select the version you wantmanually replace the minecraft.jar file in .minecraft\bin with an older version