DevKIT 245.9 (Content-Diff Download): Exception_Access_Violation 0x0000002

I’m not sure what you mean exactly.
I’ve downloaded the Zip-Package mentioned above and extracted it (overwrite) into the DevKIT Folder (H:\Epic Games\ARKDevKit).
Do I need to download the Files from GitHub (https://github.com/StudioWildcard1/Ark-Dev-Kit) as well?