Similar issue here.
I did the same process as suggested in [HOW TO] Install the phpBB SEO premod on phpBB
. However, when I log into the Admin Control Panel, I cannot view the phpBB SEO ACP module to change the settings or generate the .htaccess file.
When I try again to activate it through example.com/phpBB/phpbb_seo/phpbb_seo_install.php while logged in as admin and founder, and try to install it, It says that the module is already installed!