You can download dapulse boards onto excel easily! Click the Hamburger Menu Icon (3 lines) and click Export to Excel
Or click inside a pulse where you can export a file from the file list in the info box section. (This is assuming you have uploaded a file, see example below)
You can download files from the updates feed by clicking on the file and choose download original (see example below)
As of now we don't have an option to download all files at once, but we hope to add this feature in the near feature.