When you add new fill styles, drawing tools won't be created automatically for them. This is partly because drawing tools are specialized tools for different purposes, not a one tool per fill type of deal, as you can see some tools are smooth polys, others are fractal polys, they have different kind of outlines based on their purpose, they are set to go on the appropriate sheet and so on.

When you import fill styles you can manually create your own drawing tools that include these, but more commonly they are accessed by clicking on the Fill Style indicator in the top right of the main CC3+ window, and go to the bitmap files tab. Here you can see all the fills in the map (with preview), and whatever you pick will be the current fill which will be used when you draw things with the basic tools found in the right hand toolbar. Of course, when you use the basic tools, you also have to remember to set the sheet and other properties manually too.

Yes. It's never going to matter on normal-sized map. This is an issue for all computer programs that deals with numbers. It is possible for a program to use higher precision than CC3+ uses when higher precicion is needed, but the current use is plenty good enough for CC3+ use, and was picked with performance in mind.

This is a precision error caused by the fact that computer numbers have a limited amount of precision (number of decimals). Lines are defined by their coordinates, and when you rotate things by an arbitrary angle, those coordinates won't be pretty whole integer numbers any more (assuming they started out as such), and they become subject to tiny precision errors because the number have more decimals than the computer can handle.

Length and Bearing are values calculated from the coordinates, so when the coordinates have precision errors, so will these values.

Which installer did you use when installing this? I noticed yesterday night that I had the same issues as you on my main computer where I had only ran the individual issue installers as they arrived, but the complete 2020 installer set up the template properly on both my regular system and my test system when I installed that.

Best way to transfer effects and sheets over is to save the preset from a working map. Load up the @annual\Issue165 Smaple cliff.fcw file, go to the effects dialog, and save the current setup as a preset. Now, in your own map, load the preset. Do notice that new sheets added WILL be added to the bottom of the list, you must rearrange them yourself.

Looks like the installer may not be replacing the template properly. Do a Draw -> Insert file, pick the @Annual\Issue 165 - City Cliffs\CA165 Cliff Import.FCW file, and hit ok. Once the dialog closes and CC3+ want you to place the inserted file, hit Esc.

As for the fcw32.mac issue when re-running update 25, it is safe to simply hit ignore on it. Only thing that will happen is that you won't get a backup copy of the file if you had manually customized it (which most people never do anyway).