when i click on software update it says no update found even tho i know there is an update because my imac os x is a version 10.4.11

Choose About this Mac from the Apple menu and check the processor.

If you're using a G3, no further upgrades are available. There is no solution.

If you're using a G4 or G5 and the device is running an iOS version prior to 7.0, buy a Mac OS X 10.5 DVD from a source such as Amazon or eBay.

If you're using a G4 or G5 and the device is running iOS 7.0 or newer, there is no direct solution, but you can upgrade to Mac OS X 10.5 and then sign up for iTunes Match. The device can't be downgraded.

If you're using an Intel Mac, buy a Mac OS X 10.6 DVD from the online Apple Store.

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10.4.11 is the last update in the Tiger series. You need to upgrade to a new version of OS X dependent upon the model you own. That could be:

Leopard - 10.5.x

Snow Leopard - 10.6.x

Lion - 10.7.x

Mountain Lion - 10.8.x

Mavericks - 10.9.x

If you have a PPC Mac, then Leopard is as far as you can upgrade. If you have an Intel Mac, then see below:

Upgrading to Snow Leopard

You can 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 iCloud services; fees and

terms apply.

Upgrading from Snow Leopard to Lion or Mountain Lion to Mavericks

To upgrade to Mavericks you must have Snow Leopard 10.6.8, Lion, or Mountain Lion installed. Purchase and download Mavericks (Free) from the App Store. Sign in using your Apple ID. The file is quite large, over 5 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 Mavericks- System Requirements

Macs that can be upgraded to OS X Mountain Lion or Mavericks

1. iMac (Mid 2007 or newer) — Model Identifier 7,1 or later

2. MacBook (Late 2008 Aluminum, or Early 2009 or newer) —

Model Identifier 5,1 or later

3. MacBook Pro (Mid/Late 2007 or newer) — Model Identifier 3,1 or later

4. MacBook Air (Late 2008 or newer) — Model Identifier 2,1 or later

5. Mac mini (Early 2009 or newer) — Model Identifier 3,1 or later

6. Mac Pro (Early 2008 or newer) — Model Identifier 3,1 or later

7. Xserve (Early 2009) — Model Identifier 3,1 or later

To find the model identifier open System Profiler in the Utilities folder. It's displayed in the panel on the right.

Are my applications compatible?

See App Compatibility Table — RoaringApps.

Upgrading to Lion

If your computer does not meet the requirements to install Mavericks, 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.