JAVA
JAVA
JAVA
Without Java you can’t even extract or install the download!
I spent 2 hours trying to fix this, then I spotted a random mention of Java which gave me another thing to try.
Checked my computer (use the Java uninstaller tool to check IF you have Java and WHAT VERSION it is https://www.java.com/en/download/uninstalltool.jsp ).
No Java!
Install Java
5 minutes later, bingo.
GWS runs perfectly!