Having installed a whole pile of tracks into rFactor, I spent a bit of time over the last couple days installing a bunch of car packs and racing series as well. These were a bit more annoying since they tend to use executable installers or have more complicated install instructions, have more patches and versions to chase down, take up a lot more space, etc.
But it was worth it in the end, as I can now live out my dream of racing lawnmowers at Monaco.