Also seeing on a second site:
Warning: require_once(/public_html/wp-content/plugins/wp-user-manager/includes/functions-scoped.php ): failed to open stream: No such file or directory in /public_html/wp-content/plugins/wp-user-manager/includes/class-wp-user-manager.php on line 199
Fatal error: require_once(): Failed opening required ‘/public_html/wp-content/plugins/wp-user-manager/includes/functions-scoped.php ‘ (include_path=’.:/usr/share/pear’) in /public_html/wp-content/plugins/wp-user-manager/includes/class-wp-user-manager.php on line 199
Hi @pennink apologies for this, there was an issue during the release process. This should be fixed now for future updates. But the short term fix for you is to download this file to /public_html/wp-content/plugins/wp-user-manager/includes/
The fatals are fixed in 2.9.2 just released.