Triple post
This guide is confirmed working. He left a step out of the readme for the MU one.
EDIT: Before doing this, you MUST update your Minecraft to the latest 1.0.2 beta. Also, the update might fix the connection issues so that you don't have to do this.
1. download the files
here -
http://www.megaupload.com/?d=J1PNLRUYor here -
http://www.freefilehosting.net/mcoldversion2.
Find your minecraft main directory
Click "Run" or "Search" and search for "%appdata%" then click 'roaming' then '.minecraft'
3.
In the '.minecraft' directory, open the bin folder, and 'cut' the file named 'version'
4.
Extract the rar file which should now be downloaded, and paste the 'version' file you have just cut into the bin folder
which i have provided in the download, overrwriting the one already in there
5.
Delete the bin folder in your 'roaming/.minecraft' directory and paste in the one i have provided in the download, which should now have your own 'version' file in it.
6. Use the executable provided to play
The above links are the same one as the previous post with the MU link, which I'll just go ahead and delete.