There's no setup.py in this this version.
% ls HappyDoc3-r3_0_a1/
INSTALL.txt Makefile README.txt TestCases/
LICENSE.txt Package.mak TODO USERS.txt
Logged In: YES
Should be priority 9. There is no clear way for the casual
user to install the package without setup.py and is
therefore a showstopper.
I decided to use v2.1 instead, which installed without problems.