A working version for QGIS >=3.36 is available here: https://github.com/KoBoldMetals/qgislinedirectionhistogramplugin/releases/tag/v3.2
A working version for QGIS >=3.36 is available here:
https://github.com/KoBoldMetals/qgislinedirectionhistogramplugin/releases/tag/v3.2