Unfortunately, it doesn't help much. I have downloaded the scenes as you have proposed, but I can't see anything displayed in the viewport. Here is the screenshot.

Hello!
I have installed the OCtane Demo to see if it will make sense for me to try to switch to it from keyshot.
right now I have encountered a trouble: when I import an object and click on it simply does not appear in the viewport. All the tutorials and manuals tell that it should be visible right ...