As of my last training cut-off in September 2021, Python 3.9 can be downloaded from the official Python website. However, I’m unable to provide a direct download link or check the website for the most current information.

Here are general instructions to download Python 3.9:

1. Go to the official Python website: https://www.python.org/
2. Hover over the “Downloads” menu at the top of the page.
3. You should see options for the latest Python version for different operating systems like Windows, macOS, and Linux. If Python 3.9 is not the current version, click on “View the full list of downloads”.
4. In the full downloads page, you can see a list of all Python versions released. Find Python 3.9.x in the list (where ‘x’ is the latest minor version).
5. Click on the download link for your operating system and follow the instructions provided on the website to install Python.

Please note: It’s always best to use the latest stable version of Python unless you have specific reasons to use an older one. As of my last update, the latest version was Python 3.9, but newer versions may have been released since then. Always make sure to check the official Python website for the latest information.