The GnuCash 5.6 Windows package was missing a library, libxmlsec1.dll, that AQBanking required. I've repackaged it with the library in place as gnucash-5.6-1.setup.exe and uploaded it to Github and SourceForge. 4596d431e5785ef3d80bcbea6e1c5e1df98c3b9b27314e6d8d2eae679424f56c gnucash-5.6-1.setup.exe Regards, John Ralls