Hey mate,
I had the same problem. If you check your Services, there will be a 'Eddie Elevation Service', probably from an old install etc
Stop the service (if it's running) and from the command prompt (run as admin) type SC DELETE Eddie Elevation Service
Other option if that doesn't work is to run regedit and navigate to HKEY_LOCAL_MACHINE > SYSTEM > CurrentControlSet > Services and delete the EddieElevationService key/folder
Reboot and try again either with the portable version or installer