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I downloaded 5.5 Beta 2, and the installer for the Profiler from the same page. When I installed the profiler (after installing the Enterprise expansion and CND expansion) and restarted the IDE a dialog appeared (which I failed to capture due to the time of the morning), which said because I didn't have the module developer plugin (i think), I could not install it. However, the Beta 2 update centre does not have this avaliable for installation. Any ideas? I checked the install.log for the profiler and there was nothing amiss there.
Profiler does not use any special module than those in standart distribution of netbeans. I don't know what do Enterprise and CND expansions do but if you install NB and than profiler into the nb home folder it should work. Try to install profiler at first and than other expansions.
Closing as WORKSFORME as we weren't able to reproduce the problem and no additional feedback was provided. Please reopen the issue if you are still able to reproduce and/or provide more feedback.