Hi there.
From your first screenshot, it seems to me that you have run the “Download a File” module on its own by using the “run this module only” option after right-clicking the module. Is that correct?
While testing the modules one by one, you always need to provide the module with data that substitutes the data carried by the variable from the previous module. I believe the modules ask you for the input data before they allow you to run them on their own…
So, if you want to test the “Download a file” module on its own, just copy the file ID directly from your Gdrive or from any historical output of the previous module.
Cheers,