orgelknab wrote:... it says to "Upload pre-v5 sample set license migration request file". I don't know what file this is.
You have to generate this yourself.
With Hv5 running and licenced (I see you are able to do this), and with your old dongle attached to the computer, you will find in the main 'File' menu an item called 'Initiate migration of Hauptwerk pre-v5 sample set licenses ...'
Clicking on this is what creates the file you are asked to attach to the request.
Doing so will also erase all the licenses from your old dongle - this seems pretty scary and I dithered for some time before doing it, but actually it worked just fine for me and there were no further problems.
Nick