EliteSpawner's source code isn't public at the moment. We plan to open-source it in the future, and this page describes how the build works once you have the code.
Bought EliteSpawner? Ask for the source
If you've purchased EliteSpawner, you can request a source download. Open a ticket on our Discord and verify your purchase. Shared source code is for your own use and is covered by our Terms.
The repository doesn't include a Gradle wrapper jar. Either open the project in IntelliJ IDEA, which uses its own bundled Gradle, or generate a wrapper once with a local Gradle install:
Runtime libraries, the SQLite and MySQL drivers and HikariCP, aren't shaded into the jar. Paper's built-in library loader downloads them when the server starts.
Hub.DenizenMC