Hi Dennis
I assume that you are executing the URL in a browser, in which case this is a setting for your browser of your choice.
For Chrome you go to Settings, then Advanced and Downloads. Here you can specify the default download folder, e.g. your network folder. This will be the default download folder for all downloads, not just Apptio ones, until you change the setting back.
In Chrome (in the same settings as above) you can also choose to have Chrome ask for the location every time you download a file.
There are similar options for other browsers. Just search for "change download location <browser name>".