Eve optimized engines?

[strider3]

When I unzip this Mod, it has 2 folders..."Game Data" and "Optional". Can anyone explain the difference and how to use them?

[MaxxQ]

The main Game Data folder is the base mod.  This is what you will need to install if you're playing KSP with the stock system.

The Optional folder also contains a Game Data folder, but has a different config for the engines, set up to work in 10 atmospheres of pressure.  There's a planet in Galileo's Planet Pack called Tellumo, which has a 10 atmo pressure, which is what the optional file is for.  GPP changes the stock system, replacing all the planets, and adding different challenges.

To use the base Game Data folder, just copy it to where your KSP directory is.  It will merge with the Game Data folder already there.  If you add GPP, then you would also add the optional Game Data folder.