I have to say I'm getting lot's of positive response to this week's ScreenCastsOnline free tutorial - SCO0305a - Installing Lion - Excellent, especially as this week it's a free episode (feel free to circulate the link!). The tutorial takes you through the full install process as well as demonstrating who to create a bootable USB or DVD version of Lion, so that you can install Lion on multiple machines but download it only once, as well as using it as a backup.
However, I've received a lot of emails from people who installed Lion before watching the tutorial, and are now unable to create the USB installer drive so they have a backup, or to use on other Macs. The issue is that the standard install deletes the Installer file as part of the process so if you don't copy it, it's gone.
Even worse is that once Lion is installed, it doesn't seem to allow you to re-download the installer, perhaps forcing you to buy the official USB drive when available next month - for a cool $60.
Well the good news is that you can re-download the installer, even if you have Lion installed.
- Open the Mac App Store
- Select the Purchased Icon
- Find the entry for Lion - it will show it as installed
- Hold down the ⌥ key and Click on the OS X Lion label next to the icon
- When the Lion app page opens, the installed button changes to install
- Click on the Install button
- You'll get an warning dialog:
- Hold down ⌥ and click OK
- Hold down ⌥ and click on the Install button again
- The Lion OS X installer should start downloading again
- Follow the instructions in the original tutorial SCO0305a to make a bootable USB or DVD image.
Update: Macworld have also posted some alternative methods incase this scenario doesn't work:
If you've already installed Lion—so it's too late to move the installer—you've probably discovered that the Mac App Store claims that Lion is already installed and prevents you from downloading it again. As I explained in our main Lion-installation article, you should be able to force a re-download using one of the following three tricks: First, Option+click the Buy App button in the Mac App Store. If that doesn't work, switch to the Mac App Store's main page and then Option+click the Purchases button in the toolbar. If that doesn't work, quit the Mac App Store app and then hold down the Option key while launching the Mac App Store again. One of these three procedures should get rid of the "Installed" status for Lion and let you download it.