TallNether now updated for 1.16. There's a few changes that come with 1.16:

- Fortress custom settings are gone, it was just too much hassle trying to get structure modification to work.
- Some new settings added and some old ones removed.
- Biome sections have been added to the config layout for 1.16. The new configuration info can be found here: 1.16 Configuration

Also a couple examples of a 1.16 and pre-1.16 config: config-examples.txt

It is possible for a single config can be used for all versions, TallNether will simply ignore settings it doesn't recognize.

Known bugs:
There is an issue that may appear when creating a new world in 1.15 and 1.16. More detail and a workaround are available here: Premature Chunk Generation Bug