Update 
Author: Francos H.
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the 10.0.4.28 update wont run on my computer
Posted on the
Are you trying to install the update whilst X5 is open and running?
If so, try this...
Download the latest build from the 'Download' section located within the drop-down menu at the top right of this page, headed 'Profile'
Reboot your computer... run the setup file for the package you've just downloaded
Restart X5