Zwift crashing on launch/update

Haven’t zwifted for a few weeks. Tried to get on yesterday, and launcher tried to update.
During update process, Zwift times out and becomes unresponsive. I’ve tried several times with the same result…
I’m on a MacBook Air, running MacOS Big Sur v11.4.

Managed to use my phone to zwift last night, but my eyesight is no good, so need to get back on the big screen! Help!