We haven't removed any liveries from the RJ package, just added additional liveries. We've never had an Aer Lingus livery for the RJ85 (there is an Aer Lingus livery for the 146-300 which you may have seen some 146 screenshots of), and we've only got the Braathens livery for the RJ85 (not the RJ100).
We are starting to see some RJ liveries being posted on flightsim.to, so it may not be too long until a community member completes those two liveries.
Mark - Just Flight