A complete download should include all the content that made the sequel a step up from the original:
If you are looking for a full download of the game today, here is everything you need to know regarding availability, compatibility, and safety. Current Availability Lego Racers 2 Full Download
A unique mechanic where your car loses bricks as you take hits, eventually forcing you to run on foot to a pit stop. A complete download should include all the content
Digital copies are often hosted on historical software preservation sites. Lego Racers 2 Full Download
You will likely need to right-click the executable and set it to run in Compatibility Mode for Windows XP (Service Pack 3).
You can still find original CD-ROMs for PC and PlayStation 2 on resale sites like eBay or Mercari.