After upgrading to macOS 10.15.4, some ESET users have received the notification "Legacy System Extensions - Existing software on your system loaded a system extension signed by "ESET, spol. s.r.o."
This is a pre-release message from Apple and does not affect the functionality of ESET products at this time. If you receive the notification, click OK. No further action is required.
For more information about the notification, visit our Knowledgebase article.