Understanding the "Index of IDM Serial Number Portable" Search
Using a cracked serial number violates IDM's End User License Agreement (EULA). While individual users are rarely sued, companies face serious liabilities. In some jurisdictions (e.g., Germany, USA), downloading cracked software can result in fines up to $150,000 per instance under the Digital Millennium Copyright Act (DMCA).
A legitimate lifetime license can be purchased at Internet Download Manager.