Hi,
Sorry for the issues with the 4.1 update.
We believe we found the issue with the plugin directory name changes in our packaging sytem.
We have now resolved the issue.
I recommend to get back to the correct directory paths to deactivate and delete the premium plugins (Events Calendar PRO, Community Events and Filter Bar) and then update by getting the latest files from your account in theeventscalendar.com
https://theeventscalendar.com/my-account/downloads/
The process of deactivating and deleting the plugins does not change or delete events or settings, but it is always a good idea to have a backup.
Let us know if that helps get everything back to square one.
Thanks,
Geoff