Spectre is strange. With the License you get the HGF Sampleset, you drag the wpc into spectre (after setting the correct midi out), then you transfer, which takes 25 minutes or so. be careful your computer does not go to sleep in the process. You should see a notice about transfer in the Blofeld’s display, and a picture of a waveform. Spectre does a checksum check in the beginning, so if the samples are already in the Blofeld, it does not transfer them again, there’s just a brief flash of the transfer window. I mistook that for a failed transfer. You can also check if transfer was successful by looking at the waves available in an oscillator. Took 4 or 5 tries until I got it to work successfully (on a mac, windows might be a better experience).