Professor Hoppe’s monograph Kritik der kausalwissenschaftlichen Sozialforschung: Untersuchungen zur Grundlegung von Soziologie und Ökonomie [Critique of Causal Scientific Social Sesearch: Studies on the Foundation of Sociology and Economics] (Opladen: Westdeutscher Verlag, 1983) has been reformatted by François Guillaumat. This version is cleaner than the original and has endnotes converted to footnotes (doc; pdf; original version). A continually-updated doc version is available here.
An English translation is available at Hoppe’s Habilitation Thesis: Critique of Causal Scientific Social Research.