I am having a similar problem, if not the same one.
I have a few hundred previously purchased LRC presets, and I tried to add more yesterday, only to find that the installation silently fails. Any subsequent attempts are met with a dialog box, "Unable to import profiles and presets," that they were already loaded. Yet they're nowhere to be found.
A thread I visited here yesterday claims that the fix was trivial, yet it was never explained, so I cannot implement it.