I think we got back to you by email with this exact help, but I’ll just post the same for others reading.
HTML output doesn’t download from the disc icon using any browser that I know of. The browser will not understand what to do, create a gzip “directory”, then attempt to download but it never finishes. Why? The data isn’t really a compressed directory – it is just a single file. HTML data is handled in a special way in Galaxy for security reasons. You cannot upload HTML data at all, and downloading requires an alternate method involving the command line.
FAQ that applies to any composite dataset, or security protected dataset in Galaxy:
On a MAC, you could use the terminal program already built into the OS to access a unix compatible command line tool (wget, curl). On a PC, you could use a utility like putty https://www.putty.org/ or whatever you normally use for linux/unix access.
Example for HTML data specifically:
curl -o out.html --insecure 'link'
Where the original link copied from the dataset is something like this:
But the external display type is stripped off the end, and the URL used for the link is this:
A complete command string would be like this one. It happens to be an actual (small, test data) FastQC webpage dataset if anyone wants to test it. I’ll leave it undeleted for now.
curl -o out.html --insecure 'https://usegalaxy.org/api/datasets/f9cad7b01a472135987ad5307248c882/display?'
Note: If you happen to be working at a GDPR compliant server, like UseGalaxy.eu, you’ll need to also set the history the datasets are in to a “shared-by-link” state and include your API key. Full details are in the FAQ above.
Hope that helps!