Just a heads up. RM 1.0.50 will delete rigs from your RE copy you have on RM if the rigs were deleted from the Rig Exchange on-line. I guess this is to keep your copy of RE consistent with what is on-line. Downside is you loose access to those deleted rigs unless you've copied them off somewhere. I made a copy of my local RE before I updated so I wouldn't loose any rigs. You should consider this before doing the update.
Edit: Removed text calling it Beta #5.