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I own a Mac Mini 3.1 with Snow Leopard installed. I would like to dual boot with Lion for development purposes.

I have partitioned my hardisk as described in Point (1) in this tutorial

How to Install Dual Boot Mac OSX Lion and Snow Leopard

Can I now buy and download Lion from the apple store and then install it on the new partition?

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You'll need to make your own bootable DVD/USB of the Lion installer to do so. This can be made from the AppStore download and is documented well by OSXDaily.

Lion USB Installer
Lion DVD Installer

Then hold ALT at system boot (before chime & Apple logo) and select your install volume.

  • or install SL on the Lion partition then boot into it and install Lion directly from the app store on that – Mark Aug 8 '11 at 11:41
  • @Mark That's also a viable option, however, it's best practice to do a clean install rather than an upgrade. It takes less time and is less trouble prone. – macaco Aug 8 '11 at 13:04
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    why best practice? OSX has always emphasised upgrades – Mark Aug 8 '11 at 13:28
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    It takes less time and is less trouble prone (in my experience). It's also the best suited method for OP. – macaco Aug 8 '11 at 14:42
  • OSX usually upgrades relatively well and easily. Upgrades are emphasised to provide a better and more coherent user experience. But in general computing terms, best practice for a fresh install of an OS is to fresh install, not upgrade. – macaco Aug 8 '11 at 14:48
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Buy and download the Lion needs the Mac AppStore. So you need to boot with SL first, buy and download the Lion without installation. Then follow @macaco's answer to have a clean installation.

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Yes. Open the installer in SL and choose the 2nd partition.

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