Follow these steps and you will sort it out.
1. Take a working client which you will use to edit files, if you use your own client, make a backup first
2. Place the client into a directory named Editor
3. Download the serious editor from there
2 (public version)
4. De-compress the archive into the editor directory and overwrite all files asked
5. Go into the directory Data/Texture/Editor and create the files: Error.tex, IconsTray.tex (you can create them with notepad and leave them empty)
6. Go into Data directory and create a file named: SED_TipOfTheDay.txt with same process of above
7. Go into Bin directory and open: SeriousEditor.exe
Done. If you follow this process you can get it working.
If you still get problems, follow this also:
2
More Info:
The serious editor will work in all Operating Systems based on Windows (preferred WinXP) but the OS must be 32-bit format.
Virus Total scan of the file:
2
Theres 3 false positives, dont mind it.