I installed Platinum last night using the following method.
Sell duplicate cars, make second backup while saved driving Alfa GT. Installed Platinum, loaded OK, all good.
Retained bank balance, retained houses and all the cars left in game not modified. Gained a few new cars that must have replaced the old ones, lost a few modded cars but I can live with that.
Went straight out and bought a Transit Van love it. Hate driving with a pad so the G27 is coming out and i'm off for a hoon.
Once again my thanks to Milli and the team who have kept this alive, love you guys.
Why did I make my first purchase a transit? Because this is my daily transport.
EDIT - I bought the RS1600 mk1 Escort. In standard trim the 4 gears and suspension roll are fine. At 3rd stage tuning on one of these it would have 5 gears using a type 9 ford gearbox and would also have much stiffer suspension, better anti roll bars so body roll would be greatly reduced. Understeer would also be minimised, at the moment it's a bit too light at the front. - I'm only nit picking because I've driven one and know how they handle quite well. I do still love the fact there is an original RS in this game.