Unable to install pulumi using Windows PS, I decided to try Ubuntu:
curl -fsSL
https://get.pulumi.com | sh
apt-get update
python3 --version
apt upgrade python
--- b/c Ubuntu 16.04
$ sudo add-apt-repository ppa:deadsnakes/ppa
$ sudo apt-get update
$ sudo apt-get install python3.6
python3 --version
Python 3.5.2