Can't update the build 16288.1 (rs3-release)

I posted this yesterday.  It worked for me and several others:

I finally got mine to install and now everything is working fine.  Here's what I did:

Rean this entire instruction.  I had the same issue with the previous update and following to step 3 fixed the problem.  With this latest update 16288, there was a new wrinkle

1. Reboot PC
2. navigate to C / Windows / Software Distribution / Downloads
3. Delete the entire contents of the download folder 
   (this had worked for me on the last the release but didnt at first, read the additional steps and comments) 
4. Now navigate to C Drive and right click C, select "Properties" then click "Disk Clean-up"
5. When the pop up opens, select from the bottom left "Clean up system files" then selct everything
6. Let the process run
7. When the C drive had been cleaned, Reboot the compter
8. Check for updates and you should get a clean download and the update will install.

On this particular update.  simply deleting the C / Windows / Software Distribution / Download folder didnt work.  After I deleted it, it started downloading again.   If when trying to delete the download folder you get a message that the folder or a file is in use and connot be deleted.  Just wait.  Use the search box and type in "Windows Update"  then selct check for updates.  If the update is downloading you'll see where it is at in percentage terms.  Wait till 100% or complete and the message says waiting for system restart or reboot    DO NOT REBOOT.   Now you can follow the instructions above.  This worked for me after 6 failed attempts to get 16288 update.