How can I update Silhouette Studio if my MacBook Air won't let me open it??

Hi cmarier,

Welcome to Apple Support Communities. We understand you're unable to update Silhouette Studio on your MacBook Air. We can help point you in the right direction.

We recommend to verify if you have user permission under the user account on your Mac. This will help to verify if you have access to make changes such as updating the apps on your Mac. Here's an article with additional details: Change permissions for files, folders, or disks on Mac

In addition, we suggest to see if Silhouette Studio is compatible with your Mac. You'll want to contact the app developer for this inquiry: How to contact an app developer

Best regards.