Can I get some help! – Hilton Honors: Book Hotels Review

How do you use the older version of the app?The App Store allows an older version to be downloaded but it cannot be used due to the pop up that comes up when it's opened and asks you to download newer version. My iPad cannot download newer version due to its older and cannot update to IOS 10. If I click "close," the app closes. Why ask if I want to download an older version if it cannot brushed? Can someone at HHonors app support help?
Review by CDMRG on Hilton Honors: Book Hotels.