Have you checked that, does it already contain a crack?
Additionally the file dates display August 2000... when the patch actually has been released...?
As I said, I checked all that I could find on internet.
I also checked the official sites in the topic "Old Need for Speed Websites - Nostalgia & History". They only have the demo and the 4 cars.
Sites that I mentioned have the best version of this update, but it's still not original.
Every other file except the exe and the 3 txt files is dated 3.4.2000.
I also found cracked updates 3.3, 3.4 and 3.5 from MYTH.
3.3 is very rare, never heard of this one before, but I always wondered if it existed. Reason is it was never released in stores, from NFO: "The european store final had 3.0, USA had 3.2.". And then there was also v3.4 CD. I don't think there's a CD version of v3.3 and v3.5.
v3.3 - 3.4.2000
v3.4 - 3.5.2000 (only exe is changed from v3.3)
v3.5 - 26.6.2000, properties.txt 27.6.2000 01:38 (only exe is changed from v3.3)
I presume version.txt wasn't changed, so official ones were released on the same day.
In v3.5, every file is the same as the one from iplounge, only it doesn't have the ReadME!.txt from 10.8.2000.
So this update from iplounge (and Game Front and NFS-Planet) is certainly not the official one and was repacked from MYTH release in august 2000.
If not on internet, what's left is CD's from PC magazines from 2000. I had them, but I threw them away in 2012.