Since yesterday's (22.6.2015) update, my MiKTeX 2.9 on Windows 8.1 64-bit repeatedly crashes with an error message that is something like: missing Qt5WinExtras.dll.

This file is not present either in the MiKTeX binaries folder or in my system.

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    Run the package manager (admin if you have a multiuser installation), update the package list (menu repositories->synchronize), then check for new packages starting with miktex-. – Ulrike Fischer Jun 23 '15 at 11:45
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    I have the same problem, which after today updating of MikTeX and synchronizing package package list (updating after this says, that there is no new packages), still persist. – Zarko Jun 23 '15 at 12:05
  • @Zarko: Running the update manager doesn't help. It doesn't show new packages. You must look at the package list in the package manager (admin). – Ulrike Fischer Jun 23 '15 at 13:02
  • @UlrikeFisher, I'm lost in this. I run synchronization in package manager, check, if all MikTeX 64-bit executable are present. Between them are miktex-qt5-bin-x64, but I still get error -- not at all files, just for some of them, for example at @StevenBSeglets answer on http://tex.stackexchange.com/questions/251596/footnote-to-figure. – Zarko Jun 23 '15 at 13:50
  • I really wished you all would put a bit more effort in bug reports. Why didn't you mention directly that it is texworks that reports the crash and that one has to use and a special document to trigger it? Make a bug report in the miktex bug tracker. – Ulrike Fischer Jun 23 '15 at 14:10

The error is due to the on-the-fly installation of missing packages. When the "ask me first" is used miktex tries to show a dialog and fails. This explains the erratic number of documents showing the problem.

I made a bug report. In the meantime one can avoid the crash by setting the option to "yes" or "no", and by installing missing package before the compilation.

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