What tool are you using to do the download?
FTP ... SFTP ... cURL ... Wget ... rsync ... or right-clicking in a browser and selecting "Save As" ... each method has different characteristics.
To use cURL etc you have to first place the file in a web-accessible location but then you get the advantage of the resume-after-failure facilities which these tools provide. For example, using cURL,
curl -C - -o localfilename http://example.com/webfilename
continues after a partial download. But I've never tried downloading a file of 1.8 Gb and would rather not try. I have no idea if it would exceed the capabilities of cURL.