forecast Arima model

I have come to an end in a forecasting process. But I cannot view the estimated values for 2020. Can you help me?
old.packages()
install.packages("forecast")
library(forecast)
kargo<-read_excel("D:\Belgelerim\247482\Desktop\R Zaman serisi\Tahmin.xlsx")
plot.ts(kargo)
kargotime<-ts(kargo,frequency = 12,start = c(2013,1),)
library(TTR)
kargotime5<-SMA(kargotime, n=5)
install.packages("forecast", dependencies = TRUE)
plot.ts(kargotime5)
forecast<- forecast::Arima(kargotime5, order = c(5,0,0))

My other question is I get the following errors while installing the forecast package.

URL 'https://cran.rstudio.com/bin/windows/contrib/3.6/forecast_8.12.zip' deneniyor
Content type 'application/zip' length 2357443 bytes (2.2 MB)
downloaded 2.2 MB

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