The safest way to use Internet Download Manager is by downloading the official, untouched installer directly from the Internet Download Manager Official Website. : IDM offers a full-featured 30-day free trial.

: A powerful, modern, and completely free alternative that supports BitTorrent and integrates with most browsers.

The file name "with-activator-v3.3.rar" indicates a bundled script or executable meant to "patch" the software. Here is why downloading these files is dangerous: