Some Serious problems on Mac running 10.9.x

Ok, according to your website, Webroot Wifi Security should run on Mac 10.9.x. So I downloaded the dmg file, dragged the app to Applications and launched it. Many of the apps buttons and images are garbage, looking like static rather than images. The connect button is missing as well. The icon in the menu bar looks like a box of white static. If I hover around the connection screen, I can find the missing buttons because the cursor changes to a button press cursor when over the "missing" button. If I press it, it connects. BUT, connections speeds are almost non-existent on 10.9, failing to sometimes even connect, but even when connected, speeds are in bytes per second. (As a test, I ran on the same Wifi network using my Android phone, and speeds were good enough to stream videos.) I have screen captures of the apps window but I see no way to attach them here. But I would say regardless of what this page (https://www.webroot.com/us/en/home/products/vpn-wifi-security) it seems that you don't properly support those earlier versions of MacOS. At least, no 10.9.x anyway. (The app works find on both my High Sierra and Mojave machines.) And yes, I deleted it and downloaded it again, with the exact same results. The download was obtained on this page: https://www.webroot.com/us/en/home/products/wifi-installer-download Anyone else seeing problems on earlier versions of MacOS? Cheers