[Qgis-user] Not able to open qt designer after installing qgis via OSGeo4W

[Jochem Kail]

Dear Andrea,

The following Windows version is installed on my computer: Microsoft 
Visual C++ 2015-2022 Redistributable (x64) - 14.36.32532

The workaround you suggested solved the problem! On my computer 
msvcp140.dll was located in OSGeo4W\bin and I copied it to 
OSGeo4W\apps\Qt5\bin.

As an alternative, Thomas Nogatz suggested the following, which also 
worked: Start the OSGeo4W shell (type "OSGeo..." in Windows search). In 
the shell, enter "designer and press enter.

Many thanks!

Jochem

Am 16.02.2026 um 09:17 schrieb Andrea Giudiceandrea via QGIS-User:
> Hi Jochem,
> it looks like the issue may be related to the Microsoft Visual C++ 
> Redistributable version installed in your (and my) Windows system.
> Could you please indicate the version of the latest Microsoft Visual 
> C++ Redistributable installed in your system?
>
> To workaround the issue, you could copy the file msvcp140.dll from 
> apps\bin to apps\qt5\bin.
>
> Then you should launch the Qt Designer normally from the shortcut link 
> icon "Qt Designer with QGIS ... custom widgets".
>
> Regards.
>
> Andrea
>
> Il 16/02/2026 07:27, Jochem Kail ha scritto:
>> Dear Andrea,
>>
>> many thanks for replying. Yes, there is a report stating that 
>> designer.exe resulted in an error.
>>
>> Error code 0xc0000005, error offset 0x0000000000012f58, error 
>> process-ID, 0x204C, error path ...\OSGeo4W\apps\qt5\bin\designer.exe, 
>> error module C:\WINDOWS\SYSTEM32\MSVCP140.dll
>>
>> Best regards
>>
>> Jochem
> _______________________________________________
> QGIS-User mailing list
> QGIS-User at lists.osgeo.org
> List info: https://lists.osgeo.org/mailman/listinfo/qgis-user
> Unsubscribe: https://lists.osgeo.org/mailman/listinfo/qgis-user

-- 
sent from my R2 unit
-------------------------------------------------------
Jochem Kail
Dr. rer. nat.
University of Duisburg-Essen
Faculty of Biology
Department of Aquatic Ecology
Universitätsstrasse 5
D-45141 Essen
Germany

Room S05T03B08
Tel: +49.201.183.3046
Tel: +49.228.44636.33
Fax: +49.201.183.2179

jochem.kail at uni-due.de
http://www.uni-due.de/aquatic_ecology/staff/kail.shtml

Important note: The university server does not accept old Microsoft Office files (e.g. *.doc) but only the recent version (e.g. *.docx)!