Hey, RanDaniel,
I had the same Problem. This msi Package try to install DirectX again. Windows 10 create an issue.
I had to disable the call to install DirectX in the msi File.
Here´s the Link for downloading my changed msi file
https://www.dropbox.com/s/l4re3oubh2niwg0/EpicInstaller-7.7.0.msi?dl=0
If you want to change it by yourself, download the "Advanced Installer"
https://www.advancedinstaller.com/download.html
and delete the Custom Action "InstallDirectX" unter "Custom Behavior - Custom Actions".
That`s all!
Have fun :)