Version number of File Downloader installed at current machine.
value = getFileDownloader("FileDownloaderID").getVersion();
A string value that contains File Downloader version in the following format:
major_version, minor_version, revision_number, build_number
. E.g. 2, 0, 10, 0
.
You can use it to validate File Downloader version in the script (e.g. propose the user to update it if necessary).