Downloading Sierra from the App Store

Hi, I'm trying to make a bootable USB with unibeast on my 2006 iMac, unfortunately I can't download the Sierra installer from the App Store because my mac isn't new enough. Is there a way to fool my iMac into thinking it's newer than it is so I'm able to download the installer? I've tried using a torrent of the .dmg file but I'm always given an error. If someone could point me in the right direction that'd be much appreciated. Thanks for your help.

submitted by /u/dazacman
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