JavaFX 8 installation
If you're getting ClassNotFoundExceptions regarding nec.gui.NecApp for seemingly no reason, this is likely the cause.
Azul provides JDK builds including JavaFX: https://www.azul.com/downloads/zulu-community/?version=java-8-lts&architecture=x86-64-bit&package=jdk-fx
A recipe database (nec.db)
A prebuilt GTNH 2.0.9.0 database is available under Releases
A flow for building the database from a RecEx dump is pending, the code is present however.
Microsoft Visual C++ Redistributable for Visual Studio 2015, 2017 and 2019 (Windows users)
x64: vc_redist.x64.exe from https://support.microsoft.com/en-us/help/2977003/the-latest-supported-visual-c-downloads
or-tools