Switching from Disc game to Digital Download

[hunter301]

Hello All;

I'm redoing my old back room office (collect all room) and making it my sons bedroom for when the times when he comes home from college.
Anyway as I was digging out all of my old desktop computers that I used to play on I found a box full of my older games that I used to play.
Man there were some memories in there:
Falcon 4.0/ Janes F15/Jane's WW2 Fighters/European Air War
Jane's Fleet comand/Sub Command/Dangerous Waters/Silent Hunter III/Silent Hunter IV
So I got a bug up my (you know) and started setting up the old system in the dining room...as my wife looked at me with a panic'ed look in her eyes saying....
"OH NO!! NOT AGAIN!!" ....I just smiled saying no just checking to see if it still works. That was two months ago...hahaha.
Anyway I have got the sub bug again bad.
Never got that good at manual targeting or keeping from getting killed in SH4 but am determined to get it down.
Anyway I do a lot of out of town work and don't want to take a chance on breaking any of my classic CDs by hauling them back and forth. So for the games I can play on my laptop which seems to be most of them, I decided to fork out the cash and buy the digital download version(s).
SH4 gold edition from Amazon is supposed to be the latest and greatest version with U-boat missions and latest patch.
I already had my CD version without U-boat missions installed on my laptop when I made the decision to get digital downloads. So I uninstalled my CD version from my laptop.
Here's the question:
Is there anything else I need to do to my laptop to get any stray SH4 files removed from my previously installed CD version before doing the digital download and install?