Box Sync quit unexpectedly error message using old Mac

Hi Chris, 

Welcome to Box Community and glad to help! 

We firmly suggest for this change in your environment as Box Drive is the current Box desktop experience, does not require manual syncing (though this is available through the mark for offline option), and the issue you're experiencing is likely to be resolved straight away after installation. By installing Box Drive from this link Box Sync will be automatically uninstalled, and any files that had not synced up to Box will be preserved in your old Box Sync folder.

This article explains the difference between Sync and Drive: https://support.box.com/hc/en-us/articles/360043697354-Switching-from-Box-Sync-to-Box-Drive

This article goes into a little more detail about Box Drive and its basic functionality: https://support.box.com/hc/en-us/articles/360043697494

Let us know if you have questions, 

Stay well!