I will try also Chrome Multi-File Downloader
it requires sign up or login in the trimble account.
Then appear the download options.
The real problem I think is if the webmaster authorize or not the download.
Specially from special types of files.
The usual may be pdf, html, image or video as httrack does, but is not so easy download any type of files.
May be this target is in relation to download files from a ftp. Or even the possibility to download files from open online databases ...