Hello Eleni,
Currently you’re inserting a trial labeled “sep” between your experimental trials, which uses Ibex’s Message controller to display some text, and invites participants to use a keypress since you use transfer: "keypress". You could use transfer: "click" instead if you wanted participants to invite the participants to click instead (you can set continueMessage to a custom message if you’d like)
You cannot use the PCIbex Farm to host a file that you invite your participants to download. But if you have another hosting solution and have a direct link to that file, then you can use the HTML tag <a>, as in <a href="https://link.to.your/file" target="_blank" download="filename.ext">Click here to open/download the file</a>
Jeremy