I got Part I to V except for part II. The translator of the book is Ganganath Jha.
The all 12 chapters of Manubhashya are available here online.
Manusmrti with the Manubhashya of Medhatithi (translated by Ganganath Jha) has 10 volumes. The first two volumes contain Sanskrit verses. The English translation is present in the 3rd to 7th volumes. These five volumes are also known as Part I to Part V. 8th-10th volumes have some additional notes. Here I have added the links to the important volumes (3rd to 7th). All pdfs are good and the scan quality is excellent.