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
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