Hi Leonardo,
have you updated all the installed OSGeo4W packages to the latest versions using the OSGeo4W Setup? Some issues that could lead to the "Could not load qgis_App.dll" error in particular systems have been recently fixed in the latest version of some packages.

Otherwise, in this cases checking what's wrong with the DLLs is needed as described in https://trac.osgeo.org/osgeo4w/ticket/748#comment:5 and https://github.com/qgis/QGIS/issues/26891#issuecomment-495889169

Best regards.

Andrea Giudiceandrea


Il 04/07/2022 09:31, Leonardo Donnini ha scritto:

HiĀ  Andrea,
after manually installed the Microsoft Visual C++ Redistributable Package (Visual Studio 2015, 2017, 2019 e 2022) the error message loading QGIS was changed in :
/Could not load qgis_App.dll /
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