Never used a download manager and will not, security pupose!!!
Pros :
Faster downloads: It can split a file into several parts and download them simultaneously to make better use of the available bandwidth.
Users can pause a download and resume it later without starting again from the beginning (if the server allows it).
Automatically organizes downloaded files into categories (videos, documents, software, music, etc.).
Allows users to download several files at the same time.
Makes it possible to schedule downloads for a specific time.
Can automatically resume downloads after an Internet connection failure or a temporary error.
Displays download speed, remaining time, and progress.
Some download managers can detect and collect multiple download links.
Cons :
It may use RAM, CPU power, and Internet bandwidth.
Some malicious programs disguise themselves as download managers.
Some free versions display advertisements or suggest installing additional software
Some websites do not support external download managers.
Download speed depends on the Internet connection and the server's limitations.
Some programs require specific settings or browser extensions.
Long downloads may increase electricity consumption, especially on laptops.