Some one else found that problem using a Mac. Also had updated the KPA before, instead of updating Rig Manager first and then installing the KPA update from Rig Manager. Bacause you can do it. It´s no longer required to update the KPA using an USB if you use Rig Manager.
Check the threads talking about the update to find who was that had that same problem.
Edit: Found it for you I heard a rumor about a new Kemper Reverb that compete BIG SKY or IMMERSE type of reverb
Unfortunately, I don't have 2 computers, one with a working version of 2.1.7 for me to copy. So mine still isn't up to date. Tried removing and reinstalling, tried to install an old version and let it up date, but the old version on Kemper site is so old, there's no updater in it.
In fact, I found a 2.0.1 version, installed it and it says it's up to date! WTH? LOL
I guess I don't understand why there isn't a link to update to Rig Manager 2.1.7?