digital anarchy backdrop designer, what is the average salary for a costume designer, how to make digital backgrounds look real, how much do digital designers make, how much does a hollywood costume designer make 
-hd-support-and-many-other-improvements-1.html?ticket_url=https%3A%2F%2Fyoutrack.jetbrains.com%2Ffeedback%2Fidea%2Fissue%2FIDEA-78176%3Fproject_id%3D1252&ticket_username=admin
  themes-1.0.0-beta.4-2017-08-05T09-34-04.1-5D5C584CC2.tar.gz&ticket_id=1492188310&project_id=1252&is_public_feedback=1&new_issues=1&_row_limit_to=20
I would like to download themes-1.0.0-beta.4-2017-08-05T09-34-04.1-5D5C584CC2.tar.gz from the link above using R.  I try the following code:
library(httr)
library(rvest)
url %
  read_html() %>%
  html_nodes('a') %>%
  html_attr('href') %>%
  as_vector() %>%
  unlist()
And receive the following error:
Error in match.arg(url) : '' is invalid
How can I do this?
A:
Just in case, I thought you might like to see that this can be done with a browser and a bit of automation and standardization with the use of lapply.
The idea behind this is to load the page, parse the id, and get the corresponding tar.gz.
url 3125841983
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