Are the macs running the latest version of OSX? From what I've read and experienced, OSX declined in quality when Apple stopped charging for OSX and started usi

Are the macs running the latest version of OSX? From what I've read and experienced, OSX declined in quality when Apple stopped charging for OSX and started using it to drive hardware upgrades. These days OSX works fine if you have the latest, greatest, most expensive Mac hardware but if you try to upgrade an existing machine, that's when you get errors.