I've recently done a complete clean install on my imac and run Mac OS X 10.5.8 (233 Ghz Core 2 Duo) (2 GB) - The computer is now running very very well and fast.
Prior to the re-install I was running Lion 10.7
I am now trying to re-install Snow Leopard - At the start of the installation from the DVD it stops and I see a message " The application Register canceled installation"
My software updates are upto date. please help
Upgrade Paths to Snow Leopard, Lion, and/or Mountain Lion
You can upgrade to Mountain Lion from Lion or directly from Snow Leopard. Mountain Lion can be downloaded from the Mac App Store for $19.99. To access the App Store you must have Snow Leopard 10.6.6 or later installed.
Upgrading to Snow Leopard
You must purchase Snow Leopard through the Apple Store: Mac OS X 10.6 Snow Leopard - Apple Store (U.S.). The price is $19.99 plus tax. You will be sent physical media by mail after placing your order.
After you install Snow Leopard you will have to download and install the Mac OS X 10.6.8 Update Combo v1.1 to update Snow Leopard to 10.6.8 and give you access to the App Store. Access to the App Store enables you to download Mountain Lion if your computer meets the requirements.
Snow Leopard General Requirements
1. Mac computer with an Intel processor
2. 1GB of memory
3. 5GB of available disk space
4. DVD drive for installation
5. Some features require a compatible Internet service provider;
fees may apply.
6. Some features require Apple’s MobileMe service; fees and
terms apply.
Upgrading to Lion
If your computer does not meet the requirements to install Mountain Lion, it may still meet the requirements to install Lion.
You can purchase Lion by contacting Customer Service: Contacting Apple for support and service - this includes international calling numbers. The cost is $19.99 (as it was before) plus tax. It's a download. You will get an email containing a redemption code that you then use at the Mac App Store to download Lion. Save a copy of that installer to your Downloads folder because the installer deletes itself at the end of the installation.
Lion System Requirements
1. Mac computer with an Intel Core 2 Duo, Core i3, Core i5, Core i7,
or Xeon processor
2. 2GB of memory
3. OS X v10.6.6 or later (v10.6.8 recommended)
4. 7GB of available space
5. Some features require an Apple ID; terms apply.
Upgrading to Mountain Lion
To upgrade to Mountain Lion you must have Snow Leopard 10.6.8 or Lion installed. Purchase and download Mountain Lion from the App Store. Sign in using your Apple ID. Mountain Lion is $19.99 plus tax. The file is quite large, over 4 GBs, so allow some time to download. It would be preferable to use Ethernet because it is nearly four times faster than wireless.
OS X Mountain Lion - System Requirements
Macs that can be upgraded to OS X Mountain Lion
1. iMac (Mid 2007 or newer)
2. MacBook (Late 2008 Aluminum, or Early 2009 or newer)
3. MacBook Pro (Mid/Late 2007 or newer)
4. MacBook Air (Late 2008 or newer)
5. Mac mini (Early 2009 or newer)
6. Mac Pro (Early 2008 or newer)
7. Xserve (Early 2009)
Are my applications compatible?
See App Compatibility Table - RoaringApps.
For a complete How-To introduction from Apple see Upgrade to OS X Mountain Lion.
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Perhaps you can read my post ? and then answer
10.5.8 does not have a "clean install option." Did you erase and install, or archive and install?
I erased and installed with the original disc OS version 10.4.7.. Then I upgraded to OS X Leopard version 10.5.6
So you want to get back to 10.6.3? You'll need to buy 10.6 first. This tip explains where to buy, or what disc to use to upgrade to 10.6 or later. If you can find it, there is a USB Flash drive version of 10.7, which will install on an external hard drive with no operating system, which you can then import your data over from the 10.5 system. But it has to have no operating system. Here's the tip for upgrading to 10.6:
This tip explains what is needed for 10.7.
I cant upgrade to Snow Leopard 10.6.3 from 10.5.8
