The nightly MWSE release is now installed by default1 with MGE XE.
Nightly builds of MWSE now include Lua scripting support, new bug fixes and engine enhancements, and the Construction Set Extender.
Run MWSE-Update.exe regularly to ensure you have the latest version.
For mod authors, the best way to learn MWSE and get assistance is to ask questions in the #mwse channel of the Morrowind Modding Community Discord.
Documentation can be found here.
The Morrowind Script Extender is free software, licensed according to the GNU General Public License, and comes with ABSOLUTELY NO WARRANTY. See the file LICENSE.TXT for details if you are interested in distributing or modifying the program.
Footnotes
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If you have downloaded the archive file of MGE XE, you will need to manually run MWSE-Update.exe to install nightly MWSE. ↩