Download the newest version: http://newbiecoin.org/downloads/

Before you upgrade ,you must backup your wallet file. The wallet file (wallet.dat and files such as "ck-*") can be found in the "resources/db" folder .
Then unzip the downloaded wallet zip file (Newbiecoin-2.x.zip) to override the older files.

Please post your problems and advices here or send email to newbiecoin@gmail.com. Thanks!