If you consult this page, https://fedoraproject.org/wiki/Releases/26/Schedule you can see that there's no Beta version of Fedora 26 that has been released yet, they're still taking in submissions for changes actually. If you want a development version, you can always try the current rawhide version of fedora which is the current development version. That version can be found here.
If you consult this page, https://fedoraproject.org/wiki/Releases/26/Schedule , you can see that there's no Beta version of Fedora 26 that has been released yet, they're still taking in submissions for changes actually. If you want a development version, you can always try the current rawhide version of fedora which is the current development version. That version can be found here.