To enable the app store, just set the system region after all installed.
The Ultimate Windows Utility : https://christitus.com/windows-tool/
Open powershell with admin rights and put:
iwr -useb https://christitus.com/win | iex
When doing the account setup process disconnect the system from the internet then when setup tells you that you need a internet connection to continue, press shift + F10 then type OOBE\BYPASSNRO
Some of the gear I use is here: https://rstech224539.wordpress.com/