1. Install LilyPond
If you don’t already have LilyPond, you have to install it separately. The only supported version is 2.20.
Download LilyPond:
Decompress the package
2. Install Eclipse
If you don’t already have Eclipse, you have to install it separately. The only supported version is 2020-12.
Go to the download page of Eclipse IDE for Java Developers
Download it for your platform
Decompress the package
3. Install and configure Elysium
Elysium is an Eclipse plugin, so install it from within Eclipse.
Start Eclipse
Run Help > Eclipse Marketplace…
Search for Elysium and install it (if a Security Warning appears about unsigned content, just press OK)
After restarting Eclipse, in Preferences > LilyPond > Compiler, add a Search folder with the following path: <LilyPond installation folder>/share/lilypond/2.20.0/ly
4. Create New LilyPond Project
To edit your existing scores, you have to create a new project from them in the Score Library.
Run File > New > Project…
Select LilyPond > LilyPond Project
To import existing sources, uncheck Use default location and Browse for their folder
