I've followed all i can in this post to no effect - https://www.dell.com/community/Knowledge-Base/Solutions-for-common-SA-SupportAssist-installation-issues/ta-p/7389523

I've downloaded all Windows updates

When I try to install SupportAssist I get a message

"This installation requires an internet connection. Check your connection and try again. If your connection requires a proxy, use the following link to review or update your settings"
My internet is fine

I don't need a proxy

I'm Windows 10 64 Bit Alienware Area51 R2