I have just clicked on the 32,64 bit icon and a window says "Unsupported OS you need to run MacOSX 10.6 or above, therefore you cannot make any changes"
And yet I have Intel Core 2 Duo which is supposed to be 64 bit.

BTW, what is above 10.6?

jaybass

OS 13.6.6 iMac (Retina 5K, 27", 2017, 3.4 GHz Intel Core i5, 24 GB RAM, 2400 MHz DDR4. SuperDuper. 1 TB Lacie HD