Hmm ... I don't know what to make of those Amazon reviews. Most seem to be more recent than my 2016 purchase, and I would assume mine can't be a more...
Were you using the portable version (via portableapps.com) or the installable version (via github)? If the latter, you might try the portable version...
But you can infer the UEFI/BIOS mode from the boot disk. You don't have to look at the BIOS directly. The UEFI/BIOS mode and the boot disk GPT-vs-MBR...