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I got a couple of Surface RTs and I need a batch file to force Windows RT to update all Store apps; that is, instead of using the Store app's GUI to install updates one by one, I need some kind of command-line utility telling Windows Update to install whatever pending updates there are in the Store for all currently installed Store apps.

Any ideas?

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You can take a look at the wuauclt utility, but it's a bit cryptic. Most of the flags aren't even documented, though you can see them with the strings.exe tool from Sysinternals. – Louis Mar 26 '13 at 2:17
'wuauclt /UpdateNow' sounds promising – weberik Mar 26 '13 at 14:36
@weberik I used 'wuauclt /UpdateNow' but there is no response anywhere telling me it's working. I run in and it just...looks at me! – TheAgent Mar 27 '13 at 9:28

You can try it with the command line utility WuInstall - I did not try it with Windows RT, but it indeed worked with other Windows Versions like Windwos XP, 7 and 8

Installing all pending updates goes like

wuinstall /install

Unfortunately, the freeware version is not for download anymore at the product site, but there is a time limited trial of the commercial version and some documentation there - and i am pretty sure the free version is still around somewhere online.

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