The lp50.zip file you have requested: Modifications / Cars / foreign / Lamborghini / Lamborghini Countach LP500 - 2.01mb is not available. Perhaps try browsing all files for the game Need for Speed High Stakes and upload any files you want to share or are missing. This is the only information we could locate:
Release date: November 1999
Installation: create an LP50 subdir An addon model for a Prototype Lamborghini Countach LP500 for NFS: High Stakes. This model includes damage.