install: 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 CentOS possible default full paths are:

/usr/bin/install - from package: coreutils
/usr/lib64/R/bin/INSTALL - from package: R-core
/usr/lib/R/bin/INSTALL - from package: R-core

You may install the required package with command yum install {package}

On Debian possible default full paths are:

/usr/bin/install - from package: coreutils
/usr/lib/R/bin/INSTALL - from package: r-base-core

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

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