The most complete options are from community forums like:

Many fans argue the "weight" of the players and the shooting mechanics feel more realistic than the animation-heavy modern games. Where to Find the Best 2021 Rosters

If you'd like to dive deeper into the technical side or find specific files: (Med's NBA or UBR) Specific roster versions (Trade deadline vs. Draft) Troubleshooting (Crashing or missing textures)