I have an imac running 10.4.11 and i downloaded the update software from apple downloads and when i try to update to 10.5.1 it says open failed this version requires 10.5 what should i do?

I have an imac running 10.4.11 and i downloaded the update software from apple downloads and when i try to update to 10.5.1 it says open failed this version requires 10.5 what should i do?

You would have to purchase a retail Leopard installer DVD. Since they are difficult to find you may need to search on eBay, Amazon.com, and Google to find a suitable copy.
If you have an Intel iMac, then you may want to consider upgrading to Snow Leopard which you can purchase at any Apple retailer for $29.00 versus the minimum price of $129.00 for Leopard.
Leopard System requirements
You must have a Macintosh computer with:
an Intel processor or a PowerPC G4 (867 MHz or faster) or G5 processor
a DVD drive >built-in FireWire
at least 512 MB of RAM (additional RAM is recommended for development purposes)
a built-in display or a display connected to an Apple-supplied video card supported by your computer
at least 9 GB of disk space available, or 12 GB of disk space if you install the developer tools
Snow Leopard General requirements
Mac computer with an Intel processor
1GB of memory
5GB of available disk space
DVD drive for installation
Some features require a compatible Internet service provider; fees may apply.
Some features require Apple’s MobileMe service; fees and terms apply.
And, you could also upgrade to Lion by purchasing the Apple USB Lion flash drive installer for $69.00.
Lion System Requirements
Mac computer with an Intel Core 2 Duo, Core i3, Core i5, Core i7, or Xeon processor
2GB of memory
OS X v10.6.6 or later (v10.6.8 recommended)
7GB of available space
Some features require an Apple ID; terms apply.

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