For all those people who have a problem joining because you have to be in 1.6.4 here, download this launcher :

minecrack.fr.nf/mc/patchs/minecrack-launcher-latest.jar

After downloading this, it will be a .jar file, and jar files are safe, just browsers don't trust them. Now, save it anywhere you want. Then open it. It will ask you where to download Minecraft. Click on "Cancel". Next, wait. It will generate a file called MOL_Properties.properties or something like that. Leave that alone. If you delete it you have to start this all over again.

Now click on "New Profile". Enter your Profile Name you want (this will not effect your in game name
After that, go down and select the snapshot checkbox. Then, click on the dropdown list and choose 1.6.4

Save you're profile. Go down and enter your in game name in the username part, and then choose a password and type it. This password doesn't matter much. If you lose it just make another profile. You won't lose anything.

Now click Login then Click Play!!!

There you go! You have your own launcher! Now if you want you can change
to a snapshot and test it out or whatever, but to play HaiCraft you need 1.6.4 only!

Thanks guys I hope this was helpful! Leave any questions or problems and I will help you out
Also, please check out my Moderator application if you have time to :3
haicraft.boards.net/thread/13/fastyfoxys-mod-app

Thanks again!