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The installer, when listing the available nb55 installations on the user's machine, also listed 'Java Studio Enterprise 8' when the beta version of jse8 is installed on that machine. The installation works fine and does install cnd on top of jse8 beta and uninstaller also works fine. But jse8 is based on NB5.0 and cnd may or may not work correctly with jse8.
What installer build do you use? This issue was fixed recently as issue #87855 and fix is not in Beta3 build. Please check latest daily build.
The issue was found in beta3 installer but has been fixed in the latest version. *** This issue has been marked as a duplicate of 87855 ***