The CircleCI Windows image comes with software pre-installed . You can find a list of Software pre-installed in the Windows image here. The Windows image comes with Chocolatey Package Manager pre-installed too.
If you require software that is not already pre-installed in the image, you can install it by adding an installation step. Below you can find an example `config.yml` that uses chocolatey to install python 3.8.0 :
version: 2.1 orbs: win: email@example.com jobs: install_python_3 executor: name: win/default steps: - run: choco install python --version=3.8.0 - run: python --version