The Invincible Disabled is a Block where you cannot build on the Block. Which means you cannot place a block if you right click the Block.
The Invincible Death cause 10 hearts damage to entity that contacted the block.
The Invincible(Infinite) TNT is a TNT that you cannot break without Invincible Breaker and you cannot fuse it with a flint and steel. If you use redstone to fuse it, the TNT will stay and drop a fused tnt.
Here's the recipes:
Go to Start, run %appdata% (type it in the search box for Windows 7)
Go to .minecraft and go to bin
open minecraft.jar with WinRAR or 7zip.
drag all the file nesscary in to minecraft.jar
do the same with ModLoader
delete META-INF folder