Softaculous Issues

Have you done this?

Set $wgShowExceptionDetails = true; at the bottom of LocalSettings.php to show detailed debugging information.

It’s very strange that the database wasn’t automatically created by Softaculous… I wonder if there’s a chance it failed because it hit the inode limit, as when I had last seen a MediaWiki installation it had filled the counter very quickly, which may make it incompatible with the free hosting platform: