Hi One of the fastest ways of setting up eric in Windows is installing Anaconda python and then eric using it.  
Anaconda comes with all prerequisites of eric including qt, sip and scintilla and I had no issues doing that in Windows.
But when I tried the same in OSX it failed with below error.  
Looks like this error can happen in regular installation as mentioned in below link.
https://gist.github.com/jimk/2563701
Sorry, please install QScintilla2 and
 it's PyQt4 wrapper.
 Error: cannot import name Qsci

Looking for guidance here.