>> why an account on oracle to get a download
You do not need an account to download JDK 8, just go to [url=https://www.oracle.com/technetwork/java/javase/downloads/jdk8-downloads-2133151.html]this page[/url], click "Accept license agreement" and then click jdk-8u211-windows-x64.exe.
EDIT: ah I'm wrong, they have changed it, yes you now need an account...
PS: from what you say, if your java path is correct, you have already installed JDK8, version 161. Though installing 8.211 is probably better.