Downgrade Minecraft 1.2 to 1.1
It’s that time again! Have you just updated you Minecraft to 1.2 to find out your favourite server is still using version 1.1? Well luckily enough for you I have a solution. I had this same problem last time when Minecraft updated to 1.1 and I stumbled across a program called Minecraft Version Changer by Flippit. I wrote a little post about it back then which you can see here
Once you have downloaded the program and you have Microsoft’s .Net Framework 4 installed. Run the program, Select which version you would like to change to, and press change version. Simple.
I hope this helps you out as much as it did for me last time. Cheers guys.