Updated without a problem and either this or deleting the cbash(?) files did net me a FPS improvement, around 10% at Silverstone although I'm still suffering with micro stutter. Did do a quick torture test in the rain at Silverstone (settings as listed in profile) with 29 other Corvettes. 40 FPS mid pack wasn't bad but I did notice this game can really hammer the CPU, above 90% utilisation on two threads. Looking forward to the release of Ivy-E to help try and alleviate this bottleneck.