I'm having this exact problem. I've been fighting it alone for a week, and then I thought to check this forum. I tried everything suggested here including reinstalls. I understand that hundreds, if not thousands, of man-hours are being wasted and no solution is forthcoming. I wanted to ask people here what's the best alternative to Parallels?
ps. For a while I got the 100% Progress on that command line command, but this morning I suddenly got:
pdfm-bootstrap <Error>: prl_disk_tool: Dispather last try output: Login failed: Unable to connect to Parallels Service. Make sure that the prl_disp_service process is active and it is not blocked by Firewall. For details, please refer to this knowledgebase article (https://www.parallels.com/products/desktop/supportinfo/pdfm15_en_CA_249
Oct 4 09:27:58 pdfm-bootstrap <Error>: prl_disk_tool: Failed to initialize Parallels Desktop in unattended mode.
Also, my .hdd file is called "harddisk.hdd" not "Windows.hdd" or whatever it was the Parallels Team think it's called.