Python 2.7, including version 2.7.15, officially reached end-of-life on January 1, 2020 . This means it no longer receives security updates or bug fixes.
If you must use Python 2.7.15, it is safer to download the official Windows MSI installer directly from Python.org rather than using a third-party .rar loader. Python Source Releases PythonLoader 15 (Python 2.7).rar
The file likely refers to a specific utility or script loader designed to work with Python 2.7.15, which was a bugfix release in the Python 2.7 series. Key Context & Risks Python 2