The process of upgrading to Release 6 is new and is different from the previous upgrading process. Beginning with Release 6, you no longer perform an in-place installation. Instead, install Java CAPS 6 in a new directory, and then import your Projects from previous releases.
When upgrading from previous releases of Java CAPS to release 6:
Install Java CAPS in a new directory
Export your Projects and Environments from an earlier release of Java CAPS 5.1.0–5.1.3 or Integrated Composite Application Network Suite (ICAN Suite) 5.0.5
Import your Projects and Environments into release 6 using the NetBeansTM IDE Import Manager