While these libraries were originally commercial products sold by wondertouch, the acquisition of the technology by GenArts (now Boris FX) and the subsequent shift to the "Continuum" plugin suite has resulted in these specific legacy files becoming widely available as "abandonware" or free downloads within the VFX community since 2021.
Since particleIllusion 3.0 cannot render in 4K natively, export your particle animations as image sequences (PNG/TGA with alpha) or QuickTime movies (with alpha channel) . Import these into After Effects, Premiere Pro, DaVinci Resolve, or any game engine (Unity/Unreal) as sprite sheets.