If you are experiencing startup crashes, this is one reason.
It seems fairly random, but does seem to happen more with the Home than Pro editions... The runtimes rF2 requires are sometimes removed during major Windows 10 updates (and removed every time when upgrading from Windows 7 or 8/.1).
You can find the runtimes you need to reinstall by navigating to this folder:
steam\steamapps\common\rFactor 2\Support\Runtimes
And yes, you need to reinstall all of them.![]()
This fix makes sure that both versions of the Visual C++ redistributable are visible when you add or remove programs after installation of the update.