download_files_with_md5_mismatch: Download files marked as mismatch to package cache.
In pkgfilecache: Download and Manage Optional Package Data

Download files marked as mismatched to package cache. You should check afterwards whether this was successful, e.g., via 'files_exist_md5'.

download_files_with_md5_mismatch(
  local_files_absolute,
  local_files_md5_ok,
  urls,
  files_are_binary = NULL
)

`local_files_absolute,`	vector of strings. A vector of filenames, must already include the package cache part.
`local_files_md5_ok,`	logical vector. For each file, whether the local copy is OK. Only files for which this lists FALSE will be downloaded.
`urls,`	vector of strings. For each file, a remote URL where to download the file. Will be passed to 'downloader::download', see that function for URL encoding details.
`files_are_binary,`	logical vector. For each file, whether it is binary. Only required on Windows, when files need to be downloaded. See 'downloader::download' docs for details.