JaariAtmc

So uh yeah, you had this log, but you cut it off just before it got to the good part.

A log is a big text file. Pastebin (https://pastebin.com/) is a site that allows you to upload a lot of text.

Close programs. Restart computer. Don't have a gazillion programs open at the same time. Add more RAM. Like, the error message doesn't state your total RAM, only that you didn't have it available.

It's a dead modpack.

Use pastebin to post your log.

This dropbox link 404s.

Yeah, you'll need to see if you can still update your intel drivers (intel driver assistent, do not use windows driver update for it) and you'll have to downgrade java back to 8u51.

That's a broken modpack since the dropbox 404s.

You tried allocating 2 GB RAM, but you did not have it available at the time.

Downgrade your java to 8u51, and try to update your intel cpu/gpu drivers (check the intel site, do not use the windows update one).

Nah, that modpack requires more than 2 GB ram.

For which MC version is that randomizer datapack and for which MC version is that omega pack?

To be more exact, the game ran out of EntityIDs to hand out. This is due to too many entity adding mods.

Yeah, bitdefender is a bit overzealous at times. https://www.bitdefender.com/consumer/support/answer/2700/ Your son has a minecraft/mojang account right? We're not talking about hackphoenix or mc-launcher here, right?

World saves are found in %appdata%\.technic\modpacks\MODPACKNAME\saves.

Your crashreport starts after the actual error report. Please don't make it smaller.

You'll need to install 64bit java (https://java.com/en/download/windows_offline.jsp). Then select 2-3 GB RAM in the launcher options > Java settings.

Why are you necroing a year old post with your own issue, which is of your own making since you started the minecraft server, not the forge server. You got a vanilla world now.

Sorry, I was recently informed that its the optifine installer. Regardless, you need to use Forge 2847 (for 1.12.2), 2443 (which is for 1.12 amd yes that makes a difference).

300-400 ms of latency isn't actually that insane, nor should it be causing disconnections. That's what usually happens at 2-3 seconds (2000 - 3000 ms) of latency lag. How do you know its the latency? What server are you trying to connect to?

The idea of tracert is checking what the route is between you and the server you are trying to connect to. This might give you an idea at what point the connection starts having issues.

Add this mod to your modpack: https://www.curseforge.com/minecraft/mc-mods/notenoughids/files

Are you absolutely sure you downloaded the right Forge? The forge you included is this one: "forge-1.12-14.21.1.2443". Like, that's not even the right version for the version of optifine you included (and I should add, I have no fking clue where you got that particular one. Certainly wasn't from the optifine site).

Yes, that's a nice amount of words. Could you also include stuff like the modpack name and your save file?

Have you done a tracert (cmd.exe -> tracert IP) to check where the higher latency comes from?