As I said, rgb compatability. In other words, there's mobo's out there running software that's not compatible with the rams rgb. Does yours work as advertised? If it does, you don't need the update, but it's not gonna hurt anything to get it. If the RGB isn't working as it should, you prolly do need the update.
Either way, it's not going to affect the ram or its performance, just its colors.
When rgb first gained a foothold, everybody had their own way of doing things. Asus, Gigabyte, Corsair, msi, thermaltake etc were all different designs and not much worked in harmony or concert. You had to have asus certified stuff to work on asus mobo's, that had asus compliant connectors. Corsair was worse, they had rgb that had the exact same 4pin connectors as a pwm fan. Created all kinds of havok. The update intends to rectify that by being more compatible with more motherboards and more software, so ppl can run their corsair rgb using thermaltake software, or Nzxt hue+ etc etc. It's still not perfectly standardized, it's new, but ppl are getting there slowly but surely and most better 3rd party vendors are getting behind a single 4pin RGB etc. And that includes ram and other gizmos.