iirc u have to rename one file and delete another one? If u search the forums, u should be succesful.

https://www.daimonin.org/forums/maps/yeah-i'm-really-dumb-(question-p)/msg79232/#msg79232
was the first hit for
"DaimoninEditor.jar rename"

Yeah Nobbit's renaming js for internal updates of Gridarta, which currently isn't relevant to the B5 mapmaker anyway. So that won't help.

Looking at the error message it seems the problem is your java, bot the mapmaker at all. You don't seem to have Java installed, at least not properly.

It's Windows though so I can't help much, but try reinstalling it: www.java.com

Yeah that's probably it then. The start_editor.bat file is:
REM *** this should start the editor **
cd editor
copy DaimoninEditor.jar.tmp DaimoninEditor.jar
java.exe -jar DaimoninEditor.jar
cd ..

So I guess java is expected to be on a default path (and look, it does Nobbit's renaming automatically .

Looks like the version from http://www.java.com doesn't add the path for the java.exe. What you will need to do is add it manually.

The steps below is for a Windows 7 machine. It should also work for Windows Vista. If you are running Windows XP, it might be a little different, but since I haven't ran that for over 2 years, I can't remember off the top of my head the exact steps for that, so hopefully you are on the newer versions of Windows.

1. Click on the Start menu button. Right click Computer and go to Properties. This should bring up the System dialog.
2. Click on Advanced system settings. This should open another dialog called System Properties.
3. Click on the Advanced tab. Then click on the Environment Variables button.
4. Find where your Java is installed. The default would be in C:\Program Files\Java\jre6\bin. Note that in 64-bit versions of Windows, it will probably be within Program Files (x86) instead. If you see a bunch of executables in that directory including java.exe, then you are in the right location.
5. Now, you need to add the path to java.exe into your Path environment variable. I would recommend adding it to the user variables rather than the system variables so you won't risk screwing up your OS if you get it wrong. If the Path variable already exists there, edit it, otherwise add it. You will need to add a semicolon after the text that already exists, then add the path to java.exe. It has to point to the directory containing java.exe, not java.exe itself. So if you installed Java into the default location then it is likely to be C:\Program Files\Java\jre6\bin. You should still check to see where it is installed though to make sure that the path you type is correct.
6. Click on OK on the Environment Variables dialog to save it.
7. Now let's test to see if it works. Click on the Start menu again, go to Program Files -> Accessories -> Command Prompt. In there, type java -version. If all is working, it should tell you which version of Java you are running.
8. Run start_editor.bat and it should work fine.

i decline that renaming