I can no longer see the url from where I have downloaded a file in Get Info, can I get that back?
I'd start by rebuilding the Spotlight Index on your Mac.


  
  Choose Apple menu () > System Preferences, then click Spotlight.
  Click the Privacy tab.
  Drag the folder or disk that you want to index again to the list of locations that Spotlight is prevented from searching. Or click the
  Add (+) button and select the folder or disk to add.
  
  To add an item to the Privacy tab, you must have ownership
  permissions for that item. To learn about permissions, choose Help
  from the Finder menu bar, then search for “permissions.”
  From the same list of locations, select the folder or disk that you just added. Then click the Remove (–) button to remove it from the
  list.
  Quit System Preferences. Spotlight will reindex the contents of the folder or disk.
  


From: How to rebuild the Spotlight index on your Mac