Hi. I came across the following upload of Eusebius of Caesarea's "Preparation" in the Google Archive that members may find useful:
https://archive.org/details/p1evangelic ... 7/mode/2up
Early Christian Writings and Tertullian.org websites have published a "transcribed" version, but members may prefer the Archive reference from the Uni. of Toronto, 2011 (which was not easy to find!).
Cheers.