back to old compiler version

Author: jankae

.github/workflows/Build.yml

@@ -60,7 +60,7 @@ jobs:
         uses: jurplel/install-qt-action@v4
         with:
           version: '6.8.3'
-          arch: 'win64_mingw'
+          arch: 'win64_mingw81'
           modules: 'qtcharts'
 
       - name: Download libusb
@@ -98,10 +98,10 @@ jobs:
           cd Software/LibreCAL-GUI/release
           del *.o *.cpp
           windeployqt.exe .
-          copy ${QT_ROOT_DIR}\bin\libwinpthread-1.dll .
-          copy ${QT_ROOT_DIR}\bin\libgcc_s_seh-1.dll .
-          copy ${QT_ROOT_DIR}\bin\libstdc++-6.dll .
-          copy ${QT_ROOT_DIR}\bin\Qt6OpenGL.dll .
+          copy %QT_ROOT_DIR%\bin\libwinpthread-1.dll .
+          copy %QT_ROOT_DIR%\bin\libgcc_s_seh-1.dll .
+          copy %QT_ROOT_DIR%\bin\libstdc++-6.dll .
+          copy %QT_ROOT_DIR%\bin\Qt6OpenGL.dll .
         shell: cmd
 
       - name: Upload