Bios for 15-7569

I downloaded bios from dell website a couple weeks ago and it was version 1.9 I just download version 1.8 since I don't see a version 1.9 anymore. Did I download a bios from a malicious site claiming to be dell or did u remove bios version 1.9. Also when I run the 1.8 bios installer from dell and check the publishers certificate it says it expired April 11 2017. Dell inc. issued by entrust code signing ca- ovcs1. Please see attached picture

Thanks