Hello Gaston,
Try again. Maybe it was a temporary error on the server. I had some problems downloading the manuals, but I tried again and I was able to… tell me your experience
some manuals:
/manuales/manual-css-hojas-de-estilo.html
/manuales/manual-javascript.html
Which I imagine could not be the ones you were trying to download. Try to download also from the mobile just in case. Or with another browser, or with another network. If you tell me which are the manuals I will try to help you
Cheers!