sdownload: command not found

Maybe Your $PATH variable doesn't contain the default paths? echo $PATH should give something like:

[root@server ~]# echo $PATH
/usr/local/sbin:/usr/local/bin:/sbin:/bin:/usr/sbin:/usr/bin:/root/bin

If it's empty, You may set the PATH variable with this command

export PATH="/usr/local/sbin:/usr/local/bin:/sbin:/bin:/usr/sbin:/usr/bin:/root/bin"

On Debian possible default full paths are:

/usr/bin/sdownload - from package: xmlbeans

You may install the required package with command apt-get install {package}

Error in other languages:
sdownload: bevel nie gevind nie
sdownload: comandă negăsită
sdownload: comando não encontrado
sdownload: commande introuvable
sdownload: command not found
sdownload: käsku ei ole
sdownload: không tìm thấy lệnh
sdownload: komanda nerasta
sdownload: Kommando nicht gefunden.
sdownload: kommandot finns inte
sdownload: komut yok
sdownload: nie znaleziono polecenia
sdownload: níor aimsíodh an t-ordú
sdownload: no se encontró la orden
sdownload: no s'ha trobat l'ordre
sdownload: opdracht niet gevonden
sdownload: parancs nem található
sdownload: perintah tidak ditemukan
sdownload: príkaz nenájdený
sdownload: příkaz nenalezen
sdownload: команда не найдена
sdownload: командата не е открита
sdownload: 命令找不到
sdownload: コマンドが見つかりません