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Hi, maggiebb. Thanks for your post. Please check our system requirements as listed here. You will need to upgrade your operating system to be able to continue using your Sonos system. Please let us know if you have any further questions.
Try searching our articles for help with your question: https://www.sonos.com/en/support
I can't use my macbook pro to access Sonos ? Can you walk me though a solution here ? OSX10.9.5
If you’re still on OSX10.9.5 (Mavericks), and leaving aside your Sonos issue, you really should consider updating to the latest OS (High Sierra) in view of the latest, serious, vulnerabilities.
https://www.macrumors.com/2018/01/04/apple-meltdown-spectre-vulnerability-fixes/