I need the chunks of multithreads to be downloaded into an external USB drive

[vic9psgit]

Turbo Download Manager 3rd edition 0.6.5 on Firefox on Linux

The free space on the boot drive of my machine is very little. Its free space is too little to download big files into. I want to download files to an external USB drive.

However, Turbo Download Manager seems designed to download chunks of multithreads into the boot drive and to assemble the chunks to a final complete file into the directory that the user specified. The directory for the final complete file can be on an external USB drive, which the user can specify in the Settings of Firefox (General panel > Files and Applications > Download).

I want the chunks of multithreads to be downloaded into an external USB drive. However, I cannot figure out how to specify the directory for the chunks.

Thus, Turbo Download Manager always attempts to download chunks into the boot drive, and finds insufficient space there. As a result, Turbo Download Manager aborts the multithread download,
and passes the operation to the built-in downloader of Firefox, and the built-in downloader very slowly downloads the file with only one thread.

I want the chunks of multithreads to be downloaded into an external USB drive. If the directory for the chunks is not configurable by the user, I would like you to improve Turbo Download Manager so that the directory for the chunks will be configurable to an external USB drive.

Thank you.