trying https://www.kyoceradocumentsolutions.de/content/download-center/de/drivers/all/Linux_8_1602_ECOSYS_M5521_5526_P5021_5026_zip.download.zip
  % Total    % Received % Xferd  Average Speed   Time    Time     Time  Current
                                 Dload  Upload   Total   Spent    Left  Speed
  0  138k    0     0    0     0      0      0 --:--:-- --:--:-- --:--:--     0
curl: (22) The requested URL returned error: 404
error: cannot download source from any mirror