ParticleConverter
Will convert a SuperSpray - Pcloud or PArray to any other of the three systems - keeping as many parameters as it can with the conversion.
For a max 5 - 4.2 version of this script - please download bspack_r4_r5_v031.zip. Use the original bspack_r42.zip if you want only max 4.2 compatibility.
The only major differences between script packages are slight version compatibility issues - there are no new scripts added between the 3 packages.