It’s mentioned in the notes above, but Windows users can also download the current release of the Python install manager from python.org or from the Windows Store (the latter won’t have the latest update for a few hours, but can still install 3.14.0b1 if you py install --update 3.14 after it installs a7).
All feedback welcome and encouraged! We want this to be a smooth experience, so while the first few people to try it out may have a rough time (sorry!), your feedback is absolutely critical. Installers need to be tested at scale - controlled environments never show up all the actual issues that occur. Bugs, issues, or questions can come to https://github.com/python/pymanager
Edited to add: all runtimes back to ~3.5 can be installed already, and 3.11 onwards are “complete” installs. And existing installs will be detected, but can’t be managed/updated/etc.