Using the website option it also errors out when i test it, the html from the OP of this thread (seems to work for me).
Just tested with Windows10_InsiderPreviewEnterprise_x64_es-es_16299.iso. As it was first time today it prompted me to login after clicking 'Generate' and showed a link.
I'm trying with normal 16299.15 downloads and it doesn't work. I think I'll need to wait some hours and retry. They can me having problems or something
The insider 16299 ISO = 16299.15 Code: 9cf2c88b54096bbd1518eb161246809b62388e7c *es_windows_10_multi-edition_version_1709_updated_sept_2017_x86_dvd_100090864.iso = 9cf2c88b54096bbd1518eb161246809b62388e7c *Windows10_InsiderPreview_x32_es-es_16299.iso