Following updated instructions, I installed VirtualBox 5.2.16 on my Windows 10 computer. Then, I imported the 6.0.1 Sandbox for Hadoop appliance.
Process seemed to work without a problem.
I use a wireless router and so my network setting is Host-only Adapter.
I started the node and was able to login as MapR or as root. When I executed the ifconfig command, the inet value is 192.168.56.101.
Using Internet Explorer, the browser error message is "Can't reach this address." In the Chrome browser, https://192.168.56.101:8443 caused a "Your connection is not private" error.
So, although I can login to the virtual computer, the browsers cannot communicate with it properly.
I'm so close. What don't I know?