The latest version tries to find the blueCFD installation and if it can’t it will try to use the OpenFOAM for Windows. By default it assumes that blueCFD is installed under C:\Program Files which you can change by overwriting this line in __init__ file.
I assume that in both of your cases butterfly has failed to find the installation. Try to run the commands below in a GHPython component and see what is the results:
import butterfly
print(butterfly.config['runner'])