I understand you have an issue trying to install the driver for the Intel® Centrino® Advanced-N 6230.
It is possible this issue is caused by a corrupt Windows* installer. You may try the tool from the link below:
How to troubleshoot problems when you install or uninstall programs on a Windows-based computer
NOTE: These links are being offered for your convenience and should not be viewed as an endorsement by Intel of the content, products, or services offered there.
The fix it tool didn't detected anything.
Why? The new one was released for a purpose and should work.
I redownloaded the update from this link, 64bit for Windows 8.This time it was in zip format and I ran the DPInst64 file.
It says it is version 15.6.1
I first uninstalled the current driver 18.104.22.168 included the "uninstall driver software" option in dialog box, then ran the setup for the new one. It is still ends up installing 22.214.171.124 instead.
It is good to know you were able to install it. The version showing up in device manager (126.96.36.199) is expected for this wireless adapter model and operating system combination.