I just want to give feedback on my installation experience.
I may have missed something in the docs so it may just be user error, as usual and end user is blaming it on the developer. 
jk guys!
I did my install on a Win10 64 bit, 20h4 with a few apps already pre-installed but not much else.
My account login that I used for install is in administrators group, but when the install got to the MariaDB setup it complained about my account not have the proper permissions.
I cancelled out, uninstalled and cleaned up everything, and then re-ran with "Administrator" account for local hyper-v Win10 install and it installed fine after that and the rest of the login/setup process you mention online in documentation.
Mt Win10/hyper-v install might have just acted odd, because I have installed other tools before with Mariadb/Mysql, etc... and they have ran and installed fine with a user account added to administrators group.
Just sharing the initial experience in case it is actually an install/config setting that might need adjusted.