Checking this box is the recommended best practice for most users. It automates the entire process, appending the necessary directories to the system PATH without any further intervention. However, many users, either due to haste or lack of understanding, leave this box unchecked, leading to the error described above. Fortunately, the fix can be applied manually even after installation.
If Python is already installed but typing python in your terminal results in an error like "is not recognized as an internal or external command," you need to add it to your environment variables manually. Step 1: Find Your Python Installation Path how to add python to path windows
Once finished, Python will be automatically accessible from your command line. Method 2: Adding Python to PATH Manually Checking this box is the recommended best practice