You may need to try re-installing. Follow the instructions provided in this article Resolving challenges updating Amazon Chime Windows and macOS clients.
If that doesn't work uninstall Amazon Chime and install from https://aws.amazon.com/chime/download
View the Amazon Chime User, Administration Guide and API Reference on the AWS Documentation site.
Find more information about the Amazon Chime solution, pricing, customer references, getting started, and other resources.