Why does version matter? Earlier versions (7.0 and 7.1) suffered from texture streaming bottlenecks. If you loaded a large resource pack, viewport playback would stutter. This specific version introduced:
Render & compatibility:
Essential body motions, persona motions, and "MotionPlus" files that combine facial expressions with body movements. REALLUSION ICLONE PRO V7.2.1220.1 RESOURCE PACK