After some testing I can report more details:
The Endpoint Security and Endpoint Antivirus Live-Installer packages created in ECA (ESET Cloud Administrator) fail on any Windows 10 machine here with the "Compatible package not found" error.
Only if if there is G Data Endpoint Protection installed, the ESET Live-Installer starts without error. After uninstalling the G Data Software, ESET installer fails again - on the same machine!
Installation of G Data Endpoint Protection software works on all machines without error. Also installation of ESET All-In-One-Installers created in ESCM (ESET Security Management Center) works on all machines without error.
I assume the ECA Live-Installer packages fail due to some Windows Defender related security settings, that might be changed by installing the security software of another vendor like G Data.
I've tested on the following operating system(s): Windows 10 Pro, x64, German localization, v1809 and v1903, physical and virtual machines.
Does anyone have an idea how to get this fixed? As I'm new to ESET products: Is ECA already "stable" to be used for clients in production environments?
Any help would be greatly appreciated!