If it's the same as the Windows version then its a simple as

Choose RSR folder- navigate to the folder to you want to start with, can be Runtime/libraries or single folder Select Recursive tick box- all sub-folders will also be converted. Convert- watch the activity in the box below

Once you're sure you've done all the folders then delete the RSR files

Poser 11 , 180Gb in 8 Runtimes, PaintShop Pro 9
Windows 7 64 bit, Avast AV, Comodo Firewall
Intel Q9550 Quad Core cpu,  16Gb RAM, 250Gb + 250Gb +160Gb HD, GeForce GTX 1060