Idiot needs help please. From Steam to disc.

[Emucrawlers74]

Hi, I recently bought SH4 via steam for 2 bucks but after playing it for a bit ended up buying the cd 'gold edition' with the U boot missions. I do want to mod this. I am unfortunately a bit challenged when it comes to steering a gonkulator and am unsure if i should completely wipe the steam version before i install the cd version. In my ignorant mind i can imagine one version conflicting with the other.

Can anyone help a not too bright bloke find the best way to proceed?

There might be other stuff I should know for the installation and set up stage that isn't covered in that massive post by the Berbster, if anyone has a tip or two it would be greatly appreciated.

Thanks Lads.