Can't Download Mojave

Hello all,

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My MBP won't download Mojave because it's not supported. It's running High Sierra so I figured I could download High Sierra to create a Hackintosh boot USB with it, but I can't find HS on my list of purchased items to download. The last OS I see on the list available for download is El Capitan. How can I force a download for Mojave or High Sierra?

Thanks!

Guillermo