If you truly cannot afford $25, use the official trial repeatedly, but safely. Many open-source tools simply reset the 30-day trial registry key without modifying the IDM executable. While this violates IDM's terms of service, it is safer than downloading a pre-infected pre-activated executable because you still use the official IDMan.exe from Tonec.
But what exactly is IDM 7.1? Does a legitimate "pre-activated" version exist? And most importantly, what are the hidden costs of downloading a cracked installer? Idm 7.1 Pre-activated