Using an outdated version like 6.30 Build 15 is counterproductive. Modern websites and browsers have changed their protocols significantly since that version was released. Using an old build often results in: Inability to "grab" videos from modern streaming sites.
Run the patch file and follow the on-screen instructions. The patch will detect the installed IDM version and apply the necessary changes.
Many keygens require you to disable your antivirus or firewall to run. This leaves your entire network vulnerable to external attacks. Why You Should Avoid Build 6.30