Hi domromer,
it's just a mater of time if bookworm_gril or I dig out these threads faster:
https://www.mobileread.com/forums/sho...d.php?t=113727 follow guidline in post #5
and
https://www.mobileread.com/forums/sho...02&postcount=1
Sony software left behinde some remaining, even after uninstall.
This remainings prevent a proper new-installation and programm operation.
Remainings are in folders
\fsk for Mac and
\kinoma for Windows
HTH
Mark