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Yep, I also installed the package via pip, and then copied the gnupg.py file into the specified SmartBear directory. I then installed the full Gp4Win as well as the gnupg-w32cli-1.4 binary. My code fails on the import, before the I can even get to the code that creates the GPG object using the w32cli binary.
gpg = gnupg.GPG(gnupghome='/path/to/home/directory')
from os import sys
sys.path.insert(0, 'C:\\Users\\justin.kim\\AppData\\Local\\Programs\\Python\\Python36\\Lib\\site-packages')
import gnupg
instead of copying the packages into the tc directory, i do this instead and it seems to work... have you given this a try