Imac goes to sleep when downloading and errors occur

I have a Imac and whenever i download largish programs from the appstore which take a little while to download, the Imac goes into sleep mode and when i restart the imac, the download has stopped and says an error has occurred. I then have to restart it and resign in with my apple id and it start again.
This isn't a massive issue on programmes which take up to 30 inutes but larger programs which take a few hours to download (I am in a area with relatively low broadband speed) I cant leave it to download and go and do somehting else or leave it over night.
Does anyone know how to turn off the auto-sleep mode and leave it on conctantly until turned off ?
Thanks

Applications > System Preferences > Energy Saver
set computer sleep to never
set display sleep to never
uncheck put hard disks to sleep when possible.
or use Caffeine: Lighthead - Caffeine

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Imac goes to sleep when downloading and errors occur

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