How do I downgrade fedora 24 rawhide to 23 stable?

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You probably don't want to do this. It is not well tested, maybe nobody did that before.

In theory you could enable Fedora 23 repositories by editing /etc/yum.repos.d/*.repo files, run dnf downgrade carefully and after that run dnf distro-sync. You probably will run into incompatibilities with e.g. systemd and probably will lock up your system.

If you really have to use Fedora 23, I suggest a fresh installation.

Before downgrading to Fedora 23, you might want to try enabling some repositories (updates-testing.repo). Until Fedora 24 is released to the public, most bug fixes won't land in "normal" fedora and updates repositories due to the release process. Please update all your packages and file bugs so the issues you are running into can be fixed. With that you can help Fedora developers to improve it.

You can downgrade from one version to a previous version, but not always can you go backwards one release. Fedora24 libraries may not be compatible with with those of Fedora 23. Your best bet is to install the Fedora 24 Alpha7

https://dl.fedoraproject.org/pub/alt/... and take the alpha7 version. It is very clean.

I would save your /home partition, and with anaconda, you may reinstall, reformatting /, /boot, swap, but definitely not /home unless your wanting to start cleanly.

On or about May 3, the first Beta will be released. So far, for my workspace needs, I have not encountered problems.

If you really want to return to Fedora 23, I highly recommend Chapeau Linux ( www.chapeaulinux,org , which is Fedora 23 + audio/visual/ and some extras.