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Possible Duplicate:
Can I upgrade to Lion straight from 10.5.8?

For us 10.5 users, is the only path a two step upgrade to 10.6 then 10.7?

Also, is there a hardware compatibility chart? My mac is an older macbook, not sure if it's even supported by Lion.

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marked as duplicate by bmike, Daniel Lawson Feb 15 '12 at 22:14

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2 Answers 2

up vote 4 down vote accepted

According to this page, you need to get on Snow Leopard before installing Lion. It also gives hardware compatibility requirements, which are basically that you have an Intel Core 2 Duo (note: NOT Intel Core Duo), Core i3, Core i5, Core i7, or Xeon processor in your Mac.

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Thanks, I missed the hardware reqs there, thanks. But no memory footprint, either RAM or Disk. It also says "To update on day one". But will a disk ship on day 30? Apple usually allows two major revs back to update. –  Rich Homolka Jun 8 '11 at 19:17
    
There's been no mention of disk-based updates at this point. As for RAM, I assume Apple feels that any Mac that shipped with a Core 2 Duo would have shipped with enough memory to meet the OS's minimum. I agree that disk footprint, at least for the installation, would be helpful. –  David Jun 8 '11 at 19:24
    
According to what I see on the betas, you will want to have 4GB for the image to download and another 10GB for the upgrade. I don't have proof or official info about this, but so far that's been my little experience on an old White Macbook. –  Martín Marconcini Jun 8 '11 at 19:45
    
@Rich there's not going to be a DVD ship as far as I've seen. You will, however, be able to save the download (so far it's possible, don't know when final is released). There will be a hidden partition created by the installer where it will put all the OS ready to -reinstall + restore from TimeMachine-. If your harddrive fails, you will presumably have to re-download the image after you have SnowLeopard. I haven't seen (yet) any utility to create the DVD from the downloaded stuff (that would be a decent idea). –  Martín Marconcini Jun 8 '11 at 19:46
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I've been experimenting and i've found that inside the downloaded package for the installer (show package contents) there's a Contents/SharedSupport folder that has a InstallESD.dmg, if you burn that to a DVD it's an independent installer. I don't know if this will be officially supported or if it will work with the final version. –  Martín Marconcini Jun 8 '11 at 20:23

Please consider not only the technical but also the legal issues: Lion's license agreement requires that you own a valid license for Snow Leopard before installing Lion.

Check: https://www.macworld.com/article/161087/2011/07/install_lion_over_leopard.html for a detailed explanation of the methods availiabe to Upgrade from Leopard -> Lion

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