Forum:HELP with download

Hi,

I need a big help i visit a Minecraft forum and i register and login but on my page show this message:

LINK: http://www.minecraftforum.net/topic/257818-173smpssp-plasmacraft-liquids-acid-energy-weapons023multiplayer-beta/

An Error Occurred
Sorry, an error occurred. If you are unsure on how to use a feature, or don't know why you got this error message, try looking through the help files for more information.

[#1000B] You are not allowed to visit this forum.

And i dont know why...

i like this mod and i would like to download newest verzion please help me with download and send me a download link THX