I have laptop with UEFI. I'm trying to boot from a USB. In "UEFI/BIOS Boot Mode" I switched the mode from "UEFI" to "Legacy", disabled SECURE BOOT, but I cannot get past the activation screen, even...

In order to get the software to run from a bootable USB drive on the machine with UEFI, not only you do need to disable SECURE BOOT and switch to Legacy BIOS, you also need to disable PRE-BOOT XHCI to get past the activation/validation screens.