Basically if you have the old one, it is never updated or changed. I've got one up on Github that you (if you can figure out how to use Git/Github) can open an issue on or suggest a new change to the code (e.g., MODCAT value).
I can also take a look in here and add some manually. This isn't the decoder stickied here, but if you want your newer MODCAT to work, I've got a solution.
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