Regarding OpalCalc calculator download--
http:// www . skytopia . com/software/opalcalc/opalc_full_install . html
I've used this utility for years.
I was directed to the download page for the full version by the author since I had ended up with a demo in error.
Norton erased the download automatically regarding it a Trojan horse of some sort. I find this very difficult to believe.
I've attached Norton's explanatory screenshot????
Mark