Pre-activated versions often modify the core DLL files of the program. These modifications can lead to random crashes, system freezes, or the "fake serial key" error messages that frequently plague pirated IDM users.
While the promise of a free $25 software is tempting, the cost of a security breach is much higher. Here is what security researchers have found in GetIntoPC distributions of IDM 6.41 over the years. getintopc idm 6.41
Is Getintopc Safe? Deep Dive into Risks and Legality - Penligent Pre-activated versions often modify the core DLL files
You might get lucky and the crack works perfectly. However, you might also spend the next three months fighting a browser hijacker or lose your email password to a keylogger. getintopc idm 6.41