Export to KML (Portland) install fail on .dll load attempt

I downloaded the Export to KML extension for ArcMap and when I follow the instructions and run the batch file, the cmd comes up and as I hit a key to initiate the install, I get an error that reads:

"The module 'ExporttoKML.dll' was loaded but the call to DllRegisterServer failed with the error code 0x80004005"

OS: Windows 8.1 What I've tried: placing the ExporttoKML.dll file in my System32 folder and restarting; registering the .dll file using the cmd prompt line -

cd \windows\syswow64 regsvr32 c:\filename.dll

I was able to successfully register it, but the install error still comes up. Any thoughts?