Effective 1 November 2023, a feature was added that allows opting out of these notifications.
Skippers and Admins may access a profile for editing using the directions in the section Edit a Crew Profile. The setting listed above appear in the profile and are annotated below.

Opt Out of Crew Manger Software Update Notifications: It is recommended that this box be left unchecked so notifications are received. The box may be checked to opt out of receiving these notifications.