This query appears to reference Karafun Studio (karaoke software) along with a numeric string "12087", "serial123", and the term "free"—suggesting a search for a serial number, cracked key, or a way to obtain the software for free.

If you want to create or edit karaoke tracks today, there are safer and more advanced options than hunting for old serial numbers.

If you encounter a bug while editing a complex karaoke track, you cannot contact official support for help.