The new BOINC client (version 7.16.11) is available for macOS. You may have noticed that it is signed by Charlie Fenton, which can trigger security messages, for example from Little Snitch, etc. similar to:

Charlie Fenton (R2TC2Z4282)" instead of "The University California Berkeley (ZVCAM664D8)".

The developer has confirmed that this is to be expected. Cross-linking his post on the BOINC boards.

https://boinc.berkeley.edu/forum_thread.php?id=13958