Hey thanks very much for these links. I don't think it's possible to stitch and save to your computer though unless I'm missing something? I can view them in the correct format and it is stitching non-stitched videos nicely directly from the camera once plugged in, but the only output is to share directly to social media, which seems to have it's own set of problems.
I thought I was missing something too, until I realised the output file is saved into the same location as the input file. (I don't have my phone with me today, so I put the LG 360 memory card straight into my computer and copied a video over to my C: drive. From there I loaded it into LG 360 CAM Viewer, (it's a 12 minute video and took about three hours to process!), and lo and behold, the output file, (With "Result_" appending to the front of the filename), was in the same C: drive folder.)