The posted version to pypi has the commit timestamp. After installing with pypi it is frozen as "django-reversion-compare==0.3.4", which is a version that doesn't exist.
Thank you for reporting. I will remove the date from the versionstring in next release.
Done with 8c9a183
Relase as v0.3.5: http://pypi.python.org/pypi/django-reversion-compare/