Is there a way to change the folder Unity saves the downloaded packages?

By default it saves them on C:\ I want it to save them on D:\ where I keep all my stuff and have only the OS stuff on C:\ . Given that the partition is small I was always running out of disk space then I find out that Unity had saved all the bought packages in C:\ and they are a lot. So how can I change where the bought Assets from the Asset Store are saved? And if there's anything else that Unity saves in other places other than it's default folder I should be aware of?