Hi Kelly,
Currently, requests to https://kellymarshallresearch.umd.edu/DDMMaterials/DDMZip_AllInstbias.zip do not return the necessary allow-control-origin header, so the zip file cannot be downloaded in the background from a script that lives outside the kellymarshallresearch.umd.edu domain
If you copied the code from the guide, then you should have this line:
Header always set Access-Control-Allow-Origin "*"
Make sure to double-check that you either have "*" or "farm.pcibex.net" (or whatever domain you run your experiment from)
You’ll also want to make sure that .htaccess lives directly in the directory at https://kellymarshallresearch.umd.edu/DDMMaterials/ and not in a parent folder, for example. I know for a fact that it is possible to configure .htaccess correctly on the UMD servers, since this user was able to
If everything seems properly configured but you still cannot access the zip file from the experiment, consider reaching out to an IT person at your institution
Jeremy