Steinberg download assistant problem

I have finished downloading Cubase Elements 10 through the Steinberg download assistant. When I click on “open” in the client, it only opens the file download location with the RAR file. I cannot unpack the file because it gives an error stating “error multipart or missing archive”.
I have tried the download twice and it persists. According to my knowledge there should start a setup process after the download in steinberg download assistant?
I have also checked the dl size against the size it is supposed to be in the assistant and the displayed size in the assistant is bigger that the actual downloaded file size.
Please help?
I cannot install Cubase.