They are cumulative, you only need to install the latest one.

Looking great. Very nice work there.

The fill in the street in the second one looks a bit repetitive though.

Looks like CC3+ isn't finding your data directory for some reason. There should be a file called @.ini in your installation directory (c:\program files (x86)\ProFantasy\CC3Plus) that contain the path to your data directory. Check that this is correct.

Tools -> Global Raise -> Water Level will rise the water level by the specified amount. Works fine on the mola2x2a Mars data if that is what you are using.

The reason for this is that the hull is a massive polygon below the deck polygon, so there isn't really and edge here that can cast shadow as far as the hull is concerned. And the deck itself is set up to cast a shadow, but shadows extends outwards from the caster, not into it, you can see you have a shadow from the deck in the lower right of the map.

What I would have done here is to use a black glow (set to inside) on the Deck sheet, and disabled the wall shadow on it.

Well, things are not that much different. Yes, the miniatures and grid have been switched out by a VTT, and handwritten notes are now done digitally, but we still sit around the table, argue about the rules, and consume tons of snacks. And with a VTT you don't have to have the minis for everything. And it saves lots of space on the table.

I used to be the DM that described the place and had them draw their own maps, but I realized that it took away a lot of the game. Players would spend unnecessary much time drawing, and they would frequently ask me to repeat distances (which I could hardly refuse to do, the characters were there in the middle of the dungeon and could re-check things as often as they liked).

This is why I love the VTT and projector approach. My players only see what their characters see in that moment. It saves me from describing every minute details about direction and distance, but the players see the current situation. I don't let them see back to where they have been, only the exact place they see right now. If they want a map, they can draw it, but I save a lot in explanation, and it looks so much prettier. And I can put in semi-surprises as part of the map drawing. Now, they need to actually use their eyes to spot certain things instead of me describing everything.

Looking good. Glad you found a safer area, or those Umber Hulks would have taken good advantage of those collapsed wall segments.

Now, why would you remove the secret grass?

You should be able to assign the command

DRAWTOOLSM drawtool name;

to a menu button.

Likewise

FSTYLE fill style name;

should set the current fill style.

See this article about menu editing for doing the actual menu changes.

Do note that menus aren't style sensitive, so the buttons would only work properly as long as the current style actually have a tool/fill by that name

To get curved roads, right click the road button and select one of the Smooth tools.
As for freehand drawing, that is something rarely used in CC3 maps, but if you wish to draw a freehand road, simply use extract properties (dropper button on the left) on an existing road to set the current drawing options to match the road, then use freehand scetch (pencil icon on the right) to draw a freehand line (click once to start and once to stop, do not hold the mouse button down while drawing).