Yes, the installer of the beta release can be run over an existing 2.93 (or earlier) EventSentry installation. The installer will then upgrade the existing 2.x installation to v3.x in-place.
It is recommended that you export the configuration using the management console (File -> Export) prior to upgrading to version 3.x.
Updating from 2.92 or earlier
Since releases v2.92 and earlier utilized the MSI technology for the installer, v3.x needs to silently uninstall the existing EventSentry installation (while preserving the configuration) and install version 3.x from scratch.