Note: Some browsers may warn you that the file "can't be downloaded securely". This is due to Microsoft not having SSL enabled on their download links, but the warning can be safely ignored.
If the download doesn't start after clicking the button, copy its link and open it in a new tab manually.

If an ISO is needed and/or the ESD is encrypted, check out abbodi1406's esd-decrypter-wimlib tool. This only works on Windows.