|There are some tricks to running cables. In your case, one of them is to run the cable to the attic first, then across the house. Sometimes you can find a riser pipe or an inside chimney that goes straight to the basement.|
Running it along the main drain from the second floor bathroom is another possibility.
The last idea is to go out the window on the second floor, then down & around the house to a basement window.
How do you know when a politician is lying? His mouth is moving.