Run the installer. By default, it installs to: C:\Program Files\Java\jre1.8.0_401\bin\javaw.exe
You cannot (and should not) download javaw.exe alone. It is part of the Java Runtime Environment.
Never download javaw.exe from "dll download" websites – they are a common source of malware.
Here is the content you can use for a page, article, or support document regarding javaw.exe .
where javaw If a path appears, you already have it. No download needed. Title: Where to safely download javaw.exe?