R Markdown to PDF doesn't work

I would like to knit in pdf format, but it's missing the "url.sty"... It's the error i have... I tried to install it manualy but i don't get it... I don't have of internet connection on the work computer... I downloaded the file needed, but i don't know how i have to do... Someone can help me ?

It's hard to make any suggestions without an internet connection, as it sounds like you're missing a LaTeX component. Could you please give us more information about your setup?

There are several related suggestions here that you should try out: