[Libreoffice-bugs] [Bug 115405] Failure to launch Libreoffice 6 after installation

[bugzilla-daemon at bugs.documentfoundation.org]

https://bugs.documentfoundation.org/show_bug.cgi?id=115405

--- Comment #16 from Mike Kaganski <mikekaganski at hotmail.com> ---
(In reply to Surya Sunder Dey from comment #15)

The logs you provided tell that the redist installer detects the presence of
Universal CRT (and various api-*.dlls are part of the Universal CRT (ucrt)),
and doesn't try to install it:

> [0898:13B8][2018-04-10T10:49:17]i100: Detect begin, 10 packages
> [0898:13B8][2018-04-10T10:49:17]i000: Setting version variable 'windows_uCRT_DetectKey' to value '10.0.16299.15'
> [0898:13B8][2018-04-10T10:49:17]i000: Setting numeric variable 'windows_uCRT_DetectKeyExists' to value 1
> ...
> [0898:13B8][2018-04-10T10:49:19]i201: Planned package: Windows7_MSU_x64, state: Present, default requested: Present, ba requested: Present, execute: None, rollback: None, cache: No, uncache: No, dependency: None

The detection consists of finding the file "ucrtbase.dll" in %windir%\System32,
and getting its version. As shown above, the present version is very high
(10.0.16299.15), much higher than that of the bundled with LO (we use the
redist from the link given in comment 10, and it contains "Update for Universal
C Runtime in Windows" (KB2999226) [1] with ucrtbase version 10.0.10240.16390).
I know of the other update (KB3118401 [2]), but it also contains a lower
version: 10.0.10586.9.

So, this must mean that you system has the updated ucrt, but it is broken for
some reason, missing some components. This must have happened on the update; I
suppose it was Windows Update that has updated *and broke* the component. Why I
think so? Well: if the component was broken before the update, then proper
update would repair it. So it must be the last operation on the component that
was faulty. And since the version is higher than bundled with LO, it must mean
that the component was either pre-installed before LO, or had been updated
after.

I don't know the KB article of the update that updates ucrt on Win7 to your
version (I have created a VM with Win7x64 and am updating it ATM to find out),
but my guess is that you should uninstall the update and reinstall it using
command like

> wusa /uninstall /kb:2999226

and then reinstalling the redist.

[1] https://support.microsoft.com/en-us/help/2999226
[2] https://support.microsoft.com/en-us/help/3118401

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