- Plesk 12.0 for Windows
- Plesk 12.5 for Windows
SEF URL Joomla is not working.
Proper rewrite rule is exist in IIS - domain.tld - Rewrite rules .
Joomla was not properly upgraded.
Make sure the Joomla CMS installed via Plesk APS shows same version both in Administrative interface and in Subscriptions - domain.tld - Applications
If not, then upgrade it via Subscriptions - domain.tld - Applications - Install updates
Then enabled SEF via System - global configuration - Search Engine Friendly URLs - ON
For more details check official Joomla documentation .