Trace can be a bit weird when trying to trace a smooth poly because the nodes aren't located along the visual edge.

Try using Smooth to Straight (right click :CC2EXPLODE: ) on the poly first, then trace it, and turn it back into smooth using Straight to Smooth.

Use :CC2BREAK: to remove the parts of them you don't need. Remember you can use the :CC2MODINT: modifier to get the exact points where they cross.

Breaking a polygon WILL turn it into a line, but just continue working with the line until it is correct, and then you can turn it pack into a poly when done by right clicking :CC2EXPLODE: and picking Path to Poly. If you removed a corner during the process (which you will likely do, you'll need to add in a new one using :CC2INSNODE: to avoid a missing portion of the poly in the corner.

To make the two polys line up exactly against the border of one of them, start by trimming the light poly to the points where it meets the dark one, then make a copy of the dark one, trim it down to just that path segment where they share a border, and use Combine Paths to merge that with the light one, this will result in them both having a border in that space.

Note that it might also be simpler to delete the lighter poly, and assuming it is drawn using a drawing tool, simply use the trace feature of the drawing tool to follow along the edge of the darker poly.

Edit: Beaten by a little mouse, but with a very different approach.

That message shows up because there aren't any wall tools in that style, nothing wrong with your installation.

The forlorn cottage style is a very limited style, and works best when used along with the Dungeons of Schley style, in which it is fully integrated.

If you click the :CC2DRAWTOOLS: button and select SS4 Dungeons of Schley as the style, you can access the full set of tools. The choice is remembered for the rest of the session, so you can use buttons like the wall button after doing that. (Note that this works between these two styles because they are integrated into each other, it won't work with other styles without also first importing the fills from the other style.)

Another great looking map. Well done.

Those are the floorplan and battlemap collections right? If so, yea, they are already included in various other products/annuals

These needs to be installed separately.

Yes

For a full backup, you do need the data directory, install directory, and registry data. No dll's needs to be registered. But I'll normally recommend just backing up the data directory, and instead of backing up registry/install, do a new install and then copy over the data directory (avoid overwriting newer files).