Thank you Mark. I opted for USB install of the Everything iso. Downloaded the 8.4 GB file to a fresh partition. Copied with dd to a 16 GB pen. Up to here, all looks fine.
But when I attempt to boot from USB, I get the message > No DEFAULT or UI configuration directive found! > boot: and I don't know what to answer...Unfortunately, my last install was several years ago (SL 6.2) and I have forgotten almost everything :-(
-- Elio Fabri