Dear Dr. Rolf Heinrich Koch,

Here are two volumes by W. Geiger : the translation and the edition of Cūḷavaṃsa

https://archive.org/details/in.ernet.dli.2015.277108

https://archive.org/details/in.ernet.dli.2015.447192

Kind regards,
Gleb Sharygin
PhD student, LMU Muenchen