Not all of us are a "sir". It would be a great idea to keep your posts gender-neutral.

So you did not tell us which command you used and which package you are trying to install, and still expect that we can magically figure out what is wrong? [ Please read before posting a question ] -- How To Ask A Good Question

temporarily it might be down. try it again. I was able to access the posted URL @ shubham.birhade222