I have same problem.
I used Kemper power amp a year ago. After sell my KPA and buy new kemper stage.
I can't use old rigs(used on kemper power amp) on my new kemper stage.
I tried rename to .krig but it doesn't works.
Help me plz.
If you can't see "Allow" button, let's change your system date and time to past. I changed it 1 years ago.
And run Rig manager again.
Have a nice day.