Sav
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I looked into it a bit – no traces of the GSC (Game Script Compiler) were found in the game's or editor's executable files. This means that it's most likely impossible to "enable" the generator within the game or editor itself.
Most likely, by "a way to run GSC," they meant the following: in the original map editor from AB or SoD (if you have the necessary 5 AB files), you can generate a random map, and you can choose which version it will be, including RoE. Accordingly, after generating the map in the editor, you can save it and use it with the re-release – in theory, it's compatible with the RoE map format, and the map should work.
Most likely, by "a way to run GSC," they meant the following: in the original map editor from AB or SoD (if you have the necessary 5 AB files), you can generate a random map, and you can choose which version it will be, including RoE. Accordingly, after generating the map in the editor, you can save it and use it with the re-release – in theory, it's compatible with the RoE map format, and the map should work.