I am having the same issue. From what I have read the space could cause issues. However what I’m struggling with is how the people with UE4 have all of this working. Apparently there is a format within rsync that allows for spaces to be there so I’m not sure if that’s causing it. I have also read that the “:” after C in C:\User could cause it. I changed the name of my computer if I do recall and i still received the same error. I will have to check when I return to my PC after work. I am going to continue to dig into this and hope to resolve the issue. If you make any progress or find a solution please take the time to share.