'How to update Minecraft Forge MDK 14.23.4.2705 to 14.23.5.2860?

I have a desire to write a mod for Minecraft 1.12.2, writing a mod in 2022 for Minecraft 1.12.2 may sound like a retard, because 1.18 already exists.
I plan to write a mod on new versions in the future, but first I want to write for 1.12.2, but such a question arose.
Now I am writing this mod on MDK version 14.23.4.2705, but it is no less outdated than 14.23.5.2860, so I want to update, and that's the problem.
This MDK does not have the usual eclipse folder. On the Internet they say you just need to open the MDK folder itself, and the eclipse folder is no longer needed. Something a little different tells me... When I open this folder in Eclipse, I see nothing... Not a single file opens. An attempt to take the old assembly as a basis also does not give any result.



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