Hello
Thank you for your response. I have done so, and the results are the same.
Upon launching launcher, Game folder is deleted, and download resumes where it left off. [Eg. 4/6087 MB]
It creates a Temp folder, with a long-named ZIP file inside, called Game-[Long Hex Code].zip
I have also copied all the Game folder files from my friend into this zip file. And when opening launcher, thought I had success. It was 'checking file integrity'!
But at 65%, the launcher closed with no error. And Temp folder was gone. Dual Universe folder was down to 15.7mb again. Frustrating.
I will keep trying.