diff --git a/agent/install.sh b/agent/install.sh
index 5b274fc..0c224bc 100644
--- a/agent/install.sh
+++ b/agent/install.sh
@@ -74,17 +74,34 @@ info "Directorio: ${INSTALL_DIR}"
 info "Intervalo: ${INTERVAL}s"
 
 # ── Instalar binario ──────────────────────────────────────────────────────────
-mkdir -p "$INSTALL_DIR"
+mkdir -p "$INSTALL_DIR" || error "No se pudo crear directorio ${INSTALL_DIR} (¿permisos?)"
+
+# Verificar espacio disponible (necesita al menos 20 MB)
+AVAIL_KB=$(df -k "$INSTALL_DIR" 2>/dev/null | awk 'NR==2 {print $4}')
+if [[ -n "$AVAIL_KB" && "$AVAIL_KB" -lt 20480 ]]; then
+  error "Espacio insuficiente en ${INSTALL_DIR}: solo ${AVAIL_KB} KB disponibles (se necesitan ≥20 MB)"
+fi
+
 info "Descargando agente desde ${DOWNLOAD_URL}..."
+DEST="${INSTALL_DIR}/usite-agent"
 if command -v curl &>/dev/null; then
-  curl -fsSL "$DOWNLOAD_URL" -o "${INSTALL_DIR}/usite-agent" || error "No se pudo descargar"
+  HTTP_CODE=$(curl -fsSL --write-out "%{http_code}" "$DOWNLOAD_URL" -o "$DEST" 2>/tmp/curl_err) || {
+    CURL_ERR=$(cat /tmp/curl_err 2>/dev/null)
+    error "No se pudo descargar (HTTP ${HTTP_CODE:-?}). ${CURL_ERR}\nVerifica: df -h ${INSTALL_DIR}"
+  }
 elif command -v wget &>/dev/null; then
-  wget -q "$DOWNLOAD_URL" -O "${INSTALL_DIR}/usite-agent" || error "No se pudo descargar"
+  wget -q "$DOWNLOAD_URL" -O "$DEST" || error "No se pudo descargar con wget"
 else
   error "Se requiere curl o wget"
 fi
-chmod +x "${INSTALL_DIR}/usite-agent"
-ok "Binario descargado"
+
+# Verificar que el binario es un ejecutable válido
+if [[ ! -s "$DEST" ]]; then
+  error "El archivo descargado está vacío: ${DEST}"
+fi
+
+chmod +x "$DEST"
+ok "Binario descargado ($(du -sh "$DEST" | cut -f1))"
 
 # ── Configuración ─────────────────────────────────────────────────────────────
 cat > "${INSTALL_DIR}/agent.yml" <<EOF