Where can I find NIS 2011?

Hi everyone...

 

where can I find the Full install file for NIS 2011? I currently have NIS 2010.

Is it a good time to install NIS 2011 at this time or are there stability issues or any other bugs right now?

 

Also, shoould I still uninstall NIS2010 and run the cleanup tool BEFORE installing NIS2011 ?

 

thank you

 

Joe

 

[edit: changed subject to better reflect thread topic]