Cumulative update for Windows 10

Hi, there's a thread with details, download links and user experience per update in the News section.
See:
Cumulative Update KB4032188 Windows 10 v1703 Build 15063.502 - Windows 10 Forums

You can always visit the Update Catalog and search by KB number (and bittedness: that is, x86 for 32-bit and x64 for 64-bit) to grab and manually install updates yourself instead. That's what I usually try next if an interaction with Windows Update fails.

Title Products Classification Last Updated Version Size 2017-07 Cumulative Update for Windows 10 Version 1703 for x86-based Systems (KB4032188) Windows 10 Updates 8/1/2017 n/a 487.7 MB 511358491 2017-07 Cumulative Update for Windows 10 Version 1703 for x64-based Systems (KB4032188) Windows 10 Updates 8/1/2017 n/a 848.2 MB 889402646

The preceding stuff is the search results from the catalog cut'n'pasted herein. If you do it for real, you'll get download links to match as well.
HTH,
--Ed--

Hi, an internet search for
"Searching for update on this computer"
gives many results.

I have done the search for you.. try
FIX for Standalone Installer stuck at 2017 - YouTube
or
Fix Checking For Updates Continuously Windows 7 , 8 , 8 1, 10 - YouTube

Note: some content applies to Win 7- this has been a problem some have experienced since then at least.

This appears more thorough:
How To Fix Windows Stuck on Checking For Updates FIX 2017!! - YouTube
(Win 10 focussed)

Note: no other ref. to your error message in the forum.

Good news... sometimes it takes reattempts.