Hi guys I have the same error.
Running Win 8.1 as well.
System Info:
Processor: Intel(R) Core(TM) i7-5960X CPU @ 3.00GHz 3.00 GHz
Installed memory (RAM): 10GB
System type: 64-bit Operating System, x64-based processor
The log is identical to the sent before. (Can it be something to do with the launcher trying to load a 32 bit version of the dll ??)
Oh and the trial version is running fine, if that helps 😉