I've got an answer from support. Ticket ID: NAF-401403
This was fast, but it looks like general solution
Currently Tutorials are downloading

, but it is at only 13% now, so I cannot tell you if it will succed to install
Please try the following:
-Run the file here:
Link
-Restart your computer
-Reinstall SDC from here:
Link
Please let me know if you have any additional questions.
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Derek / WishX
[Stardock Technical Support]