General Error:SQL ERROR [ mysqli ] User already has more than 'max_user_connections'

It’s odd that you encounter this error during the installation of phpBB. The limit for max_user_connections is 4, which is plenty for most sites. Most times we see that people hit this limit is because of bad code, like creating separate database connections for every query they do. I can’t imagine the phpBB developers would make the same mistake.

And I think Softaculous is a lot easier than manual installation, no matter how easy the installation wizard is. Not having to upload any files or create any databases saves a lot of time and many steps.