Installing Mojave
How can I install Mojave on my iMac with the fusion drive and with the disk partitioned with Boot Camp?
iMac Line (2012 and Later)
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From >System Preferences>Software Update
or manually
Upgrade to macOS Mojave - Official Apple Support
https://itunes.apple.com/us/app/macos-mojave/id1398502828?mt=12
MacBook (Early 2015 or newer)
MacBook Air (Mid 2012 or newer)
MacBook Pro (Mid 2012 or newer)
Mac mini (Late 2012 or newer)
iMac (Late 2012 or newer)
iMac Pro (2017)
Mac Pro (Late 2013; Mid 2010 and Mid 2012 models with recommended Metal-capable graphics cards)