For linux:

Download ryzomcore studio

We install in order:

 ryzomcore-libs
 ryzomcore-dev
 ryzomcore-studo
 

Copy files:

Copier : 
-ryzom.ttf 
-andbarc.ttf 
-/home/*/khaganat/code/ryzom/common/data_leveldesign/leveldesign/world_editor_files
dans
/home/*/khaganat-data/primitives/

We launch ryzomcore-studio in a terminal

ryzomcore-studio

The variables are:

Plugins : /usr/share/ryzomcore/studio/plugins
Sheets : /home/*/khaganat-data/leveldesign
Assets database : */assets/database
Primitives : /home/*/khaganat-data/primitives
Ligo config file : /home/*/khaganat-push/code/ryzom/common/data_leveldesign/leveldesign/world_editor_files/world_editor_classes.xml