Want to download python3.6.x but don't know how

If you need an older Python version, you can usually install the latest Anaconda and then create a separate environment with the specific Python release you want using conda create -n myenv python=3.10 (or another version). Older Anaconda installers are also available in Anaconda’s archive section. Similar to how Easter UCAT Prep materials are updated while still supporting older study methods, Anaconda lets you work with previous Python versions without needing an outdated base installation.