This week's book giveaway is in the OO, Patterns, UML and Refactoring forum. We're giving away four copies of Refactoring for Software Design Smells: Managing Technical Debt and have Girish Suryanarayana, Ganesh Samarthyam & Tushar Sharma on-line! See this thread for details.
However, any number of things may have the path to the old version hardcoded. Look in the Properties of any IDE you use. Also look in your environment variables. Specifically check your PATH and possibly JAVA_HOME and CLASSPATH. If any of those mention the old path, update them to the new.
But for the most part, there's no big upgrade effort.