theres a lot of confusion about how to revert mineraft to a previous version. after trying a bunch of version switcher programs that didn't work i found something that did.
to begin, you must have minecraft vanilla and updated. in this case, to 1.2
download the minecraft.jar of the version you want from here:
http://www.minecraftwiki.net/wiki/Version_history/Development_versions
in this case we're reverting from 1.2 to 1.1 so we want 1.1 snapshot 12w01a:
http://assets.minecraft.net/12w01a/minecraft.jar
download it into your .minecraft/bin/ folder to overwrite the existing minecraft.jar
if you don't know how to find your .minecraft folder, just search %appdata% in windows search and it should be in there.
i'm not claiming this will work for you.. but i am saying that it worked for me the first time when all the version switcher programs did not.
if you've tried everything else you might as well give this a shot since its easy.
also i'm not responsible for anything you mess up.
to begin, you must have minecraft vanilla and updated. in this case, to 1.2
download the minecraft.jar of the version you want from here:
http://www.minecraftwiki.net/wiki/Version_history/Development_versions
in this case we're reverting from 1.2 to 1.1 so we want 1.1 snapshot 12w01a:
http://assets.minecraft.net/12w01a/minecraft.jar
download it into your .minecraft/bin/ folder to overwrite the existing minecraft.jar
if you don't know how to find your .minecraft folder, just search %appdata% in windows search and it should be in there.
i'm not claiming this will work for you.. but i am saying that it worked for me the first time when all the version switcher programs did not.
if you've tried everything else you might as well give this a shot since its easy.
also i'm not responsible for anything you mess up.