Minecraft Forge 1.12.2?

I have a problem with Forge 1.12.2.

After starting the installer, it starts briefly with a black screen, but it crashes immediately. Downloaded both versions. (Recommend and Latest)

Java has already been uninstalled and reinstalled. What can I do about it?

First you have to play the Vanilla 1.12.2 briefly. You don't have to go to any world or anything, just load the game in 1.12.2 once. Then restart your computer and run the installer directly without opening Minecraft first.

If nothing happens… Exactly the same process as usual

Are you using the correct installer? If it doesn't work with that, try the universal file.

Doesn't work the same way as before.

That's unusual. The only thing I can think of now as a possible solution would be to run the file as administrator and disable your antivirus program.

The problem is that I don't have a choice to run it as an administrator. I'm using MCAFEE and it would give me a notification that it can't start or has a virus etc.

The fact that you can't run it as an administrator is a clue. Which operating system do you use exactly?
I don't use MCAFEE myself, but many antivirus programs don't always notify you or block access to certain files on your computer.

I use Windows 10. I made the scan so that MCAFEE does not scan any viruses, but it still keeps crashing.

Could it be because of the firewall? But I don't know anything about that.