Windows 10 x64 installation - permission error running pip3 install

I’m very interested to try out Home Assistant. Will get myself a Raspberry Pi and set up per what everyone else seems to be doing. Before I can be bothered to go get the gear and learn how to do that, I thought I’d experiment with it. I already have a win10 box doing nothing (media server), so thought I would install Home Assistant on that, following the instructions on the website. Installation on a Windows system

Installled python, but when I run the command
pip3 install homeassistant

I get this error message.

ERROR: Could not install packages due to an EnvironmentError: [WinError 5] Access is denied: ‘C:\Users\SESA47~1\AppData\Local\Temp\pip-unpack-cvzr75lx\homeassistant-0.92.0-py3-none-any.whl’
Check the permissions.

I have already tried running cmd.exe as adminstrator. Also made the Homeassistant folder permissions accessible to all users read/write. I’m not sure what else to do.

Seems like a very basic problem step to get stuck at. Appreciate some help!

For initial testing you would be better to do what I did.
Install VirtualBox and then run Home Assistant in a VM with a bridged network adapter.