Hi,
Thank you for the proper details, it helped me a lot.
The plugin was not able to initialize, because of the javascript errors caused by 3rd party scripts in the console: https://i.imgur.com/PZ1INZh.png
It looks like it’s related to the isotope script, so I have turned off this option to resolve it: https://i.imgur.com/0pg2zwd.png
Please note, that this not solve the original issue, the errors caused by the other scripts are still there. I suggest checking those as well.
I also noticed that the plugin was downgraded back from version 4.13.1 to 4.13. That is not recommended, as it will very likely cause serious issues. I re-applied the update to make sure everything was working correctly. In case you need to downgrade in the future, make sure to restore the database to the previous version as well, as changing only the files is not enough.
I hope this helps!