xflr5: 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/xflr5 - from package: xflr5

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

Error in other languages:
xflr5: bevel nie gevind nie
xflr5: comandă negăsită
xflr5: comando não encontrado
xflr5: commande introuvable
xflr5: command not found
xflr5: käsku ei ole
xflr5: không tìm thấy lệnh
xflr5: komanda nerasta
xflr5: Kommando nicht gefunden.
xflr5: kommandot finns inte
xflr5: komut yok
xflr5: nie znaleziono polecenia
xflr5: níor aimsíodh an t-ordú
xflr5: no se encontró la orden
xflr5: no s'ha trobat l'ordre
xflr5: opdracht niet gevonden
xflr5: parancs nem található
xflr5: perintah tidak ditemukan
xflr5: príkaz nenájdený
xflr5: příkaz nenalezen
xflr5: команда не найдена
xflr5: командата не е открита
xflr5: 命令找不到
xflr5: コマンドが見つかりません