I ran
> make windows-installer
from cygwin, but I got the error
Traceback (most recent call last):
File "./pyuic5", line 15, in <module>
from PyQt5 import QtCore
ModuleNotFoundError: No module named 'PyQt5'
make[2]: *** [makefile:28: ui_main_wdgt.py] Error 1
make[2]: Leaving directory '/home/wingit/mnemosyne/mnemosyne/pyqt_ui'
make[1]: *** [makefile:43: build-all-deps] Error 2
make[1]: Leaving directory '/home/wingit/mnemosyne'
make: *** [makefile:93: windows-installer] Error 2
Inspecting the file in question, ui_main_wdgt.py, it is empty and doesn't show in the github repo. PyQt5 is most definitely installed, so is QtWebEngine.