Latest Sonos App compatibility

I use an iPod Touch 7th generation to control my Sonos speakers and stream music. This new Sonos version required IOS ver 16 or higher and that IOS version is not compatible with the iPod touch, It isn’t even available. Latest IOS version available is 15.8.2…. Where can I get detailed instruction on how to load the older version of Sonos? I assume I will have to turn off auto update and remove / re-install.