On Linux (Debian, Raspbian, Mint, Ubuntu):
apt-get update; apt-get install python3
Mint an Ubtuntu should support Python 3.7 I think.
On Raspbian Buster Python 3.7 is the current release.
I know this, because I'm working with it :-)
On Windows 10:
Open the Windows App-Store, search for Python, install it.
If you're not allowed to carry USB-Sticks into your company and your PC has no access to internet, you can't install Python.
Very simple. If you require the latest Python for your work, ask you boss. Tell your boss, that Python 2.7 is outdated and dangerous.
If he ask why this could be dangerous, give him this link:
https://www.zdnet.com/article/uk-cyberse...ity-risks/
Quote:"If you're still using 2.x, it's time to port your code to Python 3," the NCSC said. "If you continue to use unsupported modules, you are risking the security of your organisation and data, as vulnerabilities will sooner or later appear which nobody is fixing."