Mod distinction

I haven't stayed up-to-date with RF2 happenings for some time.
Is there currently any way to identify and separate official content from everything else?
Having seen all the positive reports, I made the purchase.
I'm not sure...(its been a very long time)...but I do believe I had a modded version prior.
Now, I'm not sure if I'm still on that one or the official S397 circuit.
There was no big download after purchasing or game startup.
I have not driven it in a while.
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