Q: update not installing

What update?  10.11.4?  Have you tried downloading the combo update from the Apple website?

Download OS X El Capitan 10.11.4 Combo Update

More information would help. What happens when you try to install the RAW format update? Have you tried installing the update in the Safe Mode or another admin account? If you go to the  menu with the option/alt key held down you can run System Information. In the Software/Installation section, does the update show there?

Safe Mode - About El Capitan

Safe Mode Startup – El Capitan.

RiversfromJackson wrote:

 

Eric,

 

i haven't tried safe mode and I looked in sys info. and it's not there. Is there not a way to download and install?

what is the easiest way to attempt in safe mode if I,can't DL and install?

 

thank you so very much

RIvers

I provided the link to the combo update on Apple's website if you cannot get the install to work through the App Store.  Have you tried it?