Sonos 1 on Macbook

I have just had a MacBook rebuild and want to b e able to access my Sonos 1 units using it. It tells me that I need a firmware update and that I should consider updating my system. Well given that I have 6 different Sonos 1 systems, all of which work, I have considered that I would be mad to buy new stuff. Is there any way that I can get the Sonos app back on this MacBook?