Hello guys, I have my GUI for scanning purposes that works perfectly fine in QT Creator.
I use Qt 5.12.4 and mingw73_64 as compiler.
It is now times to create the installer with Inno Setup Compiler.

In order to know which DLL to include in my installer I run this command:
Qt Code: 
  1. E:\BMS\Qt\5.12.4\mingw73_64\bin>windeployqt.exe --no-translations --list mapping D:\Svn\Scanner\build-******Scan-Qt_5_12_4_mingw73_64-Release\release
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I get this output:
Qt Code: 
  1. "E:\BMS\Qt\5.12.4\mingw73_64\bin\Qt5Core.dll" "Qt5Core.dll"
  2. "E:\BMS\Qt\5.12.4\mingw73_64\bin\Qt5Gui.dll" "Qt5Gui.dll"
  3. "E:\BMS\Qt\5.12.4\mingw73_64\bin\Qt5Multimedia.dll" "Qt5Multimedia.dll"
  4. "E:\BMS\Qt\5.12.4\mingw73_64\bin\Qt5Network.dll" "Qt5Network.dll"
  5. "E:\BMS\Qt\5.12.4\mingw73_64\bin\Qt5Svg.dll" "Qt5Svg.dll"
  6. "E:\BMS\Qt\5.12.4\mingw73_64\bin\Qt5Widgets.dll" "Qt5Widgets.dll"
  7. "E:\BMS\Qt\5.12.4\mingw73_64\bin\libGLESV2.dll" "libGLESV2.dll"
  8. "E:\BMS\Qt\5.12.4\mingw73_64\bin\libEGL.dll" "libEGL.dll"
  9. "E:\BMS\Qt\5.12.4\mingw73_64\bin\D3Dcompiler_47.dll" "D3Dcompiler_47.dll"
  10. "E:\BMS\Qt\5.12.4\mingw73_64\bin\opengl32sw.dll" "opengl32sw.dll"
  11. "E:\BMS\Qt\Tools\mingw530_32\bin\libgcc_s_dw2-1.dll" "libgcc_s_dw2-1.dll"
  12. "E:\BMS\Qt\Tools\mingw530_32\bin\libstdc++-6.dll" "libstdc++-6.dll"
  13. "E:\BMS\Qt\Tools\mingw530_32\bin\libwinpthread-1.dll" "libwinpthread-1.dll"
  14. "E:\BMS\Qt\5.12.4\mingw73_64\plugins\audio\qtaudio_windows.dll" "audio\qtaudio_windows.dll"
  15. "E:\BMS\Qt\5.12.4\mingw73_64\plugins\bearer\qgenericbearer.dll" "bearer\qgenericbearer.dll"
  16. "E:\BMS\Qt\5.12.4\mingw73_64\plugins\iconengines\qsvgicon.dll" "iconengines\qsvgicon.dll"
  17. "E:\BMS\Qt\5.12.4\mingw73_64\plugins\imageformats\qgif.dll" "imageformats\qgif.dll"
  18. "E:\BMS\Qt\5.12.4\mingw73_64\plugins\imageformats\qicns.dll" "imageformats\qicns.dll"
  19. "E:\BMS\Qt\5.12.4\mingw73_64\plugins\imageformats\qico.dll" "imageformats\qico.dll"
  20. "E:\BMS\Qt\5.12.4\mingw73_64\plugins\imageformats\qjpeg.dll" "imageformats\qjpeg.dll"
  21. "E:\BMS\Qt\5.12.4\mingw73_64\plugins\imageformats\qsvg.dll" "imageformats\qsvg.dll"
  22. "E:\BMS\Qt\5.12.4\mingw73_64\plugins\imageformats\qtga.dll" "imageformats\qtga.dll"
  23. "E:\BMS\Qt\5.12.4\mingw73_64\plugins\imageformats\qtiff.dll" "imageformats\qtiff.dll"
  24. "E:\BMS\Qt\5.12.4\mingw73_64\plugins\imageformats\qwbmp.dll" "imageformats\qwbmp.dll"
  25. "E:\BMS\Qt\5.12.4\mingw73_64\plugins\imageformats\qwebp.dll" "imageformats\qwebp.dll"
  26. "E:\BMS\Qt\5.12.4\mingw73_64\plugins\mediaservice\dsengine.dll" "mediaservice\dsengine.dll"
  27. "E:\BMS\Qt\5.12.4\mingw73_64\plugins\mediaservice\qtmedia_audioengine.dll" "mediaservice\qtmedia_audioengine.dll"
  28. "E:\BMS\Qt\5.12.4\mingw73_64\plugins\platforms\qwindows.dll" "platforms\qwindows.dll"
  29. "E:\BMS\Qt\5.12.4\mingw73_64\plugins\playlistformats\qtmultimedia_m3u.dll" "playlistformats\qtmultimedia_m3u.dll"
  30. "E:\BMS\Qt\5.12.4\mingw73_64\plugins\styles\qwindowsvistastyle.dll" "styles\qwindowsvistastyle.dll"
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Then I have to add SSL 64 bits dll. I am not too sure the ones I have to include so I put all of them, the 6 that are in my OpenSSL 1.1.1h bin folder:
Qt Code: 
  1. capi.dll
  2. dasync.dll
  3. libcrypto-1_1-x64.dll
  4. libssl-1_1-x64.dll
  5. ossltest.dll
  6. padlock.dll
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My installer looks ready. First run I get an error message saying that the software cannot be run cause the library "libgcc_s_seh-1.dll" is missing.

So I added this dll in my Inno Setup Compiler script:
Qt Code: 
  1. [Files]
  2. Source: "E:\BMS\Qt\5.12.4\mingw73_64\bin\Qt5Core.dll"; DestDir: "{app}\"; Flags: ignoreversion
  3. Source: "E:\BMS\Qt\5.12.4\mingw73_64\bin\Qt5Gui.dll"; DestDir: "{app}\"; Flags: ignoreversion
  4. Source: "E:\BMS\Qt\5.12.4\mingw73_64\bin\Qt5Multimedia.dll"; DestDir: "{app}\"; Flags: ignoreversion
  5. Source: "E:\BMS\Qt\5.12.4\mingw73_64\bin\Qt5Network.dll"; DestDir: "{app}\"; Flags: ignoreversion
  6. Source: "E:\BMS\Qt\5.12.4\mingw73_64\bin\Qt5Svg.dll"; DestDir: "{app}\"; Flags: ignoreversion
  7. Source: "E:\BMS\Qt\5.12.4\mingw73_64\bin\Qt5Widgets.dll"; DestDir: "{app}\"; Flags: ignoreversion
  8. Source: "E:\BMS\Qt\5.12.4\mingw73_64\bin\libGLESv2.dll"; DestDir: "{app}\"; Flags: ignoreversion
  9. Source: "E:\BMS\Qt\5.12.4\mingw73_64\bin\libEGL.dll"; DestDir: "{app}\"; Flags: ignoreversion
  10. Source: "E:\BMS\Qt\5.12.4\mingw73_64\bin\D3DCompiler_47.dll"; DestDir: "{app}\"; Flags: ignoreversion
  11. Source: "E:\BMS\Qt\5.12.4\mingw73_64\bin\opengl32sw.dll"; DestDir: "{app}\"; Flags: ignoreversion
  12. ; the next one is not listed by windeployqt.exe
  13. Source: "E:\BMS\Qt\5.12.4\mingw73_64\bin\libgcc_s_seh-1.dll"; DestDir: "{app}"; Flags: ignoreversion 
  14.  
  15. Source: "E:\BMS\Qt\Tools\mingw530_32\bin\libgcc_s_dw2-1.dll"; DestDir: "{app}\"; Flags: ignoreversion
  16. Source: "E:\BMS\Qt\Tools\mingw530_32\bin\libstdc++-6.dll"; DestDir: "{app}\"; Flags: ignoreversion
  17. Source: "E:\BMS\Qt\Tools\mingw530_32\bin\libwinpthread-1.dll"; DestDir: "{app}\"; Flags: ignoreversion
  18.  
  19. Source: "E:\BMS\Qt\5.12.4\mingw73_64\plugins\audio\qtaudio_windows.dll"; DestDir: "{app}\audio"; Flags: ignoreversion
  20. Source: "E:\BMS\Qt\5.12.4\mingw73_64\plugins\bearer\qgenericbearer.dll"; DestDir: "{app}\bearer"; Flags: ignoreversion
  21. Source: "E:\BMS\Qt\5.12.4\mingw73_64\plugins\iconengines\qsvgicon.dll"; DestDir: "{app}\iconengines"; Flags: ignoreversion
  22. Source: "E:\BMS\Qt\5.12.4\mingw73_64\plugins\imageformats\qgif.dll"; DestDir: "{app}\imageformats"; Flags: ignoreversion
  23. Source: "E:\BMS\Qt\5.12.4\mingw73_64\plugins\imageformats\qicns.dll"; DestDir: "{app}\imageformats"; Flags: ignoreversion
  24. Source: "E:\BMS\Qt\5.12.4\mingw73_64\plugins\imageformats\qico.dll"; DestDir: "{app}\imageformats"; Flags: ignoreversion
  25. Source: "E:\BMS\Qt\5.12.4\mingw73_64\plugins\imageformats\qjpeg.dll"; DestDir: "{app}\imageformats"; Flags: ignoreversion
  26. Source: "E:\BMS\Qt\5.12.4\mingw73_64\plugins\imageformats\qsvg.dll"; DestDir: "{app}\imageformats"; Flags: ignoreversion
  27. Source: "E:\BMS\Qt\5.12.4\mingw73_64\plugins\imageformats\qtga.dll"; DestDir: "{app}\imageformats"; Flags: ignoreversion
  28. Source: "E:\BMS\Qt\5.12.4\mingw73_64\plugins\imageformats\qtiff.dll"; DestDir: "{app}\imageformats"; Flags: ignoreversion
  29. Source: "E:\BMS\Qt\5.12.4\mingw73_64\plugins\imageformats\qwbmp.dll"; DestDir: "{app}\imageformats"; Flags: ignoreversion
  30. Source: "E:\BMS\Qt\5.12.4\mingw73_64\plugins\imageformats\qwebp.dll"; DestDir: "{app}\imageformats"; Flags: ignoreversion
  31. Source: "E:\BMS\Qt\5.12.4\mingw73_64\plugins\mediaservice\dsengine.dll"; DestDir: "{app}\mediaservice"; Flags: ignoreversion
  32. Source: "E:\BMS\Qt\5.12.4\mingw73_64\plugins\mediaservice\qtmedia_audioengine.dll"; DestDir: "{app}\mediaservice"; Flags: ignoreversion
  33. Source: "E:\BMS\Qt\5.12.4\mingw73_64\plugins\platforms\qwindows.dll"; DestDir: "{app}\platforms"; Flags: ignoreversion
  34. Source: "E:\BMS\Qt\5.12.4\mingw73_64\plugins\playlistformats\qtmultimedia_m3u.dll"; DestDir: "{app}\playlistformats"; Flags: ignoreversion
  35. Source: "E:\BMS\Qt\5.12.4\mingw73_64\plugins\styles\qwindowsvistastyle.dll"; DestDir: "{app}\styles"; Flags: ignoreversion
  36.  
  37. Source: "D:\Svn\Scanner\build-******Scan-Qt_5_12_4_mingw73_64-Release\release\**********_Scanner.exe"; DestDir: "{app}\"; Flags: ignoreversion
  38.  
  39. Source: "E:\BMS\OpenSSL-Win64\bin\capi.dll"; DestDir: "{app}"; Flags: ignoreversion
  40. Source: "E:\BMS\OpenSSL-Win64\bin\dasync.dll"; DestDir: "{app}"; Flags: ignoreversion
  41. Source: "E:\BMS\OpenSSL-Win64\bin\libcrypto-1_1-x64.dll"; DestDir: "{app}"; Flags: ignoreversion
  42. Source: "E:\BMS\OpenSSL-Win64\bin\libssl-1_1-x64.dll"; DestDir: "{app}"; Flags: ignoreversion
  43. Source: "E:\BMS\OpenSSL-Win64\bin\ossltest.dll"; DestDir: "{app}"; Flags: ignoreversion
  44. Source: "E:\BMS\OpenSSL-Win64\bin\padlock.dll"; DestDir: "{app}"; Flags: ignoreversion
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Then I got an error saying that the software cannot be started correctly. Like an instant crash while it is working fine in Qt Creator. So I have few questions:

1. Why windeployqt is listing 3 dll from "mingw530_32"?
2. Why windeployqt does not list "mingw73_64\bin\libgcc_s_seh-1.dll"?
3. Could this explain why the software cannot start correctly?
4. Is there a way to know which dll from openSSL I am supposed to include?

Thank you!