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I have Netbeans IDE 5.0 with Netbeans Profiler 5.0 installed on my machine and would like to try Netbeans IDE 5.5 Beta 2 with Netbeans Profiler 5.5 Beta 2 but without uninstalling the Netbeans Profiler 5.0 which is used by the Netbeans IDE 5.0. But I noticed 2 things which can mean problems with such a configuration: 1) The documentation and installer tell me to uninstall any previous versions of Netbeans Profiler. 2) The Netbeans Profiler stores the calibration data in a directory (%USERPROFILE%\.nbprofiler) wich doesn't change from version to version like that used by the Netbeans IDE (%USERPROFILE%\.netbeans\5.0). I suspect that the only thing that may really prevent side by side installations of different versions of Netbeans Profiler is the fact that the data directory is always the same independentely of the Netbeans Profiler version. It would be nice that different Netbeans Profiler versions could coexist on the same machine like it happens with the other modules, e.g. IDE, Mobility Pack, etc.
This was fixed in NB 6.0