Q: where can i download mac os 10.6.7 update

Works for me.

What do you mean by does not work for you?

Allan

You cannot download any version of Snow Leopard itself. In your case you can only update to 10.6.8 using Mac OS X 10.6.8 Update Combo v1.1.

To go past Snow Leopard to Lion or Mavericks:

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 at the Online Apple Store. 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 Mavericks

You can upgrade to Mavericks from Lion or directly from Snow Leopard. Mavericks can be downloaded from the Mac App Store for FREE.

Upgrading to Mavericks

To upgrade to Mavericks you must have Snow Leopard 10.6.8 or Lion installed. Download Mavericks from the App Store. Sign in using your Apple ID. Mavericks is free. 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 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.

That's not the link that you want. No one needs it. It's out of date.

You need: http://support.apple.com/kb/DL1399

The one that Kappy provided above, for 10.6.8, not 10.6.7.

You probably don't really want 10.6.7, as Lanny has explained, but it's here

 http://download.info.apple.com/Mac_OS_X/061-9524.20110321.Sx74f/MacOSXUpd10.6.7.dmg

If I were to get 10.6.7, I'd get the combo version:

http://support.apple.com/kb/DL1361

Note there was also a font update for it:

http://support.apple.com/kb/DL1377

There are very few reasons not to get 10.6.8 versus 10.6.7.  10.6.7's security for Flash and Java are not up to date, and Java is not up to date anyway, even in 10.6.8, but at least you get better security using 10.6.8.