Failure to download "Blank form" on ODK collect from wepi

Welcome to the ODK forum, @Hugo! We're glad you're here. When you get a chance, please introduce yourself on this forum thread. I'd also encourage you to add a picture as your avatar because it helps build community!

Wepi (https://www.wepi.org/) is not part of the core ODK ecosystem and therefore not supported on this forum. It looks like you can report errors with their system to them via their service desk.