version 2.5.9d1 breaks WP down

footnotes have been automatically updated and the website stopped; I had to enter the emergency mode and switch the plugin off. Removing and reinstalling does not help. When switching the plugin on, I get a warning:

`Warning: scandir(/home/staho/domains/ocena-ryzyka.pl/public_html/wp-content/plugins/footnotes/class/layout/): failed to open dir: No such file or directory in /home/staho/domains/ocena-ryzyka.pl/public_html/wp-content/plugins/footnotes/includes.php on line 23

Warning: scandir(): (errno 2): No such file or directory in /home/staho/domains/ocena-ryzyka.pl/public_html/wp-content/plugins/footnotes/includes.php on line 23

Warning: Invalid argument supplied for foreach() in /home/staho/domains/ocena-ryzyka.pl/public_html/wp-content/plugins/footnotes/includes.php on line 25

Fatal error: Uncaught Error: Class ‘MCI_Footnotes_Layout_Init’ not found in /home/staho/domains/ocena-ryzyka.pl/public_html/wp-content/plugins/footnotes/class/init.php:139 Stack trace: #0 /home/staho/domains/ocena-ryzyka.pl/public_html/wp-content/plugins/footnotes/class/init.php(89): MCI_Footnotes->initialize_dashboard() #1 /home/staho/domains/ocena-ryzyka.pl/public_html/wp-content/plugins/footnotes/footnotes.php(61): MCI_Footnotes->run() #2 /home/staho/domains/ocena-ryzyka.pl/public_html/wp-admin/includes/plugin.php(2299): include(‘/home/staho/dom…’) #3 /home/staho/domains/ocena-ryzyka.pl/public_html/wp-admin/plugins.php(191): plugin_sandbox_scrape(‘footnotes/footn…’) #4 {main} thrown in /home/staho/domains/ocena-ryzyka.pl/public_html/wp-content/plugins/footnotes/class/init.php on line 139`

WordPress 5.6.2
PHP: 7.4.15
footnotes plugin: 2.5.9.d1 of 2021-03-01
other plugins active: NONE (all the plugins were switched off for testing)

Previous version (2.5.8) worked fine.

The page I need help with: [log in to see the link]