Well, I FINALLY was able to get Joomla 4 installed ( Alpha5, then updated OK to Alpha 6).
But I went to try installing CJForum for preliminary testing, and the CJLib (Version: v2.8.3) errored out on install:
Call to undefined method Joomla\CMS\Filesystem\File::read()
JInstaller: :Install: Error SQL Invalid default value for 'created'
Package Install: There was an error installing an extension: com_cjlib.zip
Was just wondering if you have ever managed to do an install on a J4 Alpha - or if I am getting ahead of myself here? ( the CJForum download page does says "Joomla v4 or later"...)
If yes, then what Build have you tested?