The 64-bit UEFI iso boots on UEFI and BIOS laptops; ceni connects just fine as usual.
This build should install on either a UEFI or BIOS computer, correct? If so, I don't see a reason for the non-UEFI iso, just do one build of a uefi capable iso and call it good. The only reason to have a non-uefi build would be for 32-bit if you decide to keep supporting that.