Logger Pro 3.15 and earlier will generate an error message on computers running macOS 10.14.4 and later. The full text of the error message is “Logger Pro has not been optimized for your Mac and needs to be updated.” The message is repeated every 30 days until you have updated the software.

If you are seeing this message, update your software to Logger Pro 3.16. http://www.vernier.com/support/updates/logger-pro/

This update will also resolve the issue related to Logger Pro not being 64 bit.