Tried powershell command and got this:

PS C:\Users\Steve> powershell -ExecutionPolicy Unrestricted Add-AppxPackage -DisableDevelopmentMode - Register $Env:SystemRoot\WinStore\AppxManifest.XMLpowershell : The term 'powershell' is not recognized as the name of a cmdlet, function, script file, or operable program. Check the
spelling of the name, or if a path was included, verify that the path is correct and try again.
At line:1 char:1
+ powershell -ExecutionPolicy Unrestricted Add-AppxPackage -DisableDevelopmentMode ...
+ ~~~~~~~~~~
+ CategoryInfo : ObjectNotFound: (powershell:String) [], CommandNotFoundException
+ FullyQualifiedErrorId : CommandNotFoundException

WIndows Firewall is on -

Not sure how to fix -