#2 - Sept. 20, 2012, 1:47 p.m.
Currently, the Guild Wars 2 download application will resume file downloads. However, there seems to be a bit of confusion as to how it does that. When the download is stopped for any reason, you need to close and restart the launcher. When you do this, the application will scan the already downloaded files to make sure they are intact. Once the files are scanned, the download continues. The confusion comes from how the “scan” appears in the launcher. When this process is taking place it will look like it is downloading the files again, complete with “download speeds.” However, if you notice the download speed, it should be much faster than your Internet connection. This is because the launcher isn’t actually downloading the files from the Internet but is instead, scanning the files inside the GW2.dat file. Once the scan completes, the download resumes and your actual bandwidth is used.
That being said, if you experienced a power outage or a full on crash during the update, it is very likely you will need to re-download these files.