Clicking on the Download button causes the following error. Independant of Options Frontend tab settings: Activate direct-downloading and View Download detail page. Also noticed that the Title Link is active even if 'Use Downloads title as download link' is set to No. But the 'Use Link in Symbols' does respond as setting of 'Use Link in Symbols'.
Error Report
404 Page not found
Call stack
# Function Location
1 () JROOT\libraries\src\Router\Router.php:153
2 Joomla\CMS\Router\Router->parse() JROOT\libraries\src\Application\SiteApplication.php:736
3 Joomla\CMS\Application\SiteApplication->route() JROOT\libraries\src\Application\SiteApplication.php:224
4 Joomla\CMS\Application\SiteApplication->doExecute() JROOT\libraries\src\Application\CMSApplication.php:294
5 Joomla\CMS\Application\CMSApplication->execute() JROOT\includes\app.php:61
6 require_once() JROOT\index.php:32
[Fixed in 4.0.18]