Does waterclass add new rivers, lakes and change coast lines? Or does it just add new textures to the existing default water?I have this scenery that came with waterclass but I don't really want to install it if the file will add new textures to my water. I already use waterzone.zip for my water textures and don't want to change that.

Waterclass doesn't add textures, rivers, coastlines, or lakes--instead it "reassigns" water textures from the existing textures (either default or your replacement) available to MSFS. As an example, picture a tropical isle that's supposed to have that beautiful turquoise water along the shore. MSFS includes this in many islands, and on others it's absent even though their real life counterparts may have that water color along the shore. With waterclass, you can reassign the turquoise textures (within the limitations that waterclass/landclass enforces) along the shores of your favorite tropical isle, or make a river delta appear "muddy" where the river outflows into the ocean.Some have modified the .inf file I use with my program, Landclass Assistant for this, while others use other tools..-John

Thanks John! I will add the waterclass file that came with the scenery I was talking about. :-)