Hello,
Possible issue with v2.18.x on Windows 8.1 regarding TAP drivers;
I moved from v2.17.2 to v2.18.5. Upon first launch, EDDIE tried to install the new TAP drivers and I got a driver installation failure notice. I rebooted, and tried to launch again, EDDIE tried to install the TAP drivers again and failed again.
I downloaded the TAP driver installer directly, noticing there are two versions. One labelled Win10 and one Win7. I noticed on the OpenVPN site it was stating to use the Win7 driver with Win8.1. I tried to install the Win10 driver to test, as EDDIE labels Win10/8.1/8 the same. I got the same error message when installing "tap-windows-9.23.3-I601-Win10" as I do when EDDIE tries to install them.
I then uninstalled the TAP drivers and installed the Win7 version "tap-windows-9.23.3-I601-Win7". EDDIE now launches and sees the drivers and functions as normal.
Perhaps with the new TAP builds, different versions are now required to be bundled with EDDIE for Win8.1/8
Hope that helps.