I’m afraid the update hasn’t happened. In the history and WordPress plugin I see version 1.15.2 twice and no version 1.15,4. And the zip-file also contains version 1.15.2. Please upload the correct version 1.15.4
Thanks for reporting. The issue has been fixed , you can download 1.15.4 now.
Please update The Events Calendar Virtual Events 1.15.4 to 1.15.5 @FestingerUpdates
The Events Calendar Virtual Events has been updated to 1.15.5.