Run these commands from the home directory. In my case I was logged as Administrator.
PS > wget -UseBasicParsing `
https://repo.anaconda.com/miniconda/Miniconda3-latest-Windows-x86_64.exe `
-O Miniconda3-latest-Windows-x86_64.exe
PS > Miniconda3-latest-Windows-x86_64.exe /InstallationType=JustMe `
/RegisterPython=0 /D=%UserProfile%\Miniconda3
PS > cd .\miniconda3\condabin\
PS > .\conda init powershell
References: