Hello Matt,
Probably the easiest way would be to use environment variables to get close to the location. The USERPROFILE variable will normally get you C:\Users\username, so you could simply do:
dlDir = fullfile(getenv('USERPROFILE'), 'Downloads');
Alternatively, you could build the file path using just the USERNAME variable:
dlDir = fullfile('C:\Users', getenv('USERNAME'), 'Downloads');
Or you could try a non-environment-variable method, using the userpath. By default, userpath on Windows is usually C:\Users\username\Documents\MATLAB, so you could parse out the first part of that using fileparts or strsplit. Then add 'Downloads' with fullfile.
However, all of these depend on one or more of these directories being in the standard location for Windows. Before using the directory, it is probably a good idea to check that it exists first. Otherwise you may error, or create it, depending on how you use it.
-Cam
