These allow attackers to gain remote access to your computer.
If you find IDM too expensive, there are several powerful and free open-source alternatives that provide similar functionality without the security risks:
Using a "lifetime serial key" found on a third-party site is a violation of the software's End User License Agreement (EULA).
The "patching" process can break core features of the downloader, leading to frequent crashes or failed downloads.
An open-source download management tool with a large community of support.