Larry69- no probs- it's not the most intuitive of ways to have to install.
Ataros- I run with a GTX580 1.5gb @ 1920*1200 and clouds run fps at around 30 for me. Large(20+) bomber formations are a bigger problem, tho this seems to be a cpu problem more than gpu. I do give some suggestions for lowering settings in the readme (switching shadows and orig texture off can make the difference for me)
Part1 has clouds in some missions, part2 has alot more as weather changes with autumn. Let's just say the last mission will be 'fun'
Jamesdietz-things that are changed:
the changed fm's for some of the planes does alter the timings of some things so nearly every mission has been tweaked, a couple required a rethink/redo. Briefings timings have been updated too.
Cloud icing is alot more severe than with 1.07 so has been turned to minimum but even so I had to move/remove some. This was the biggest PITA with final release patch for me.
The 'success criteria' in the scripts has been redone.
So yes, just copy the new Spitfire onmmy tail folder over your existing one (steamapps one) and you should be able to carry on.