JaariAtmc

https://forum.feed-the-beast.com/threads/internal-exception-java-io-ioexception-bad-packet-id-72.31617/

Portforwarding is fine as it is, as long as you don't open certain ports. Hamachi, for example, is a much larger issue, as it opens a massive hole in the firewall. Important things to consider is if there's still any firewall blocking java. If you didn't change anything, there might still be one more firewall rule blocking java, and you need just that one. With localhost, did you mean 127.0.0.1 or localhost?

The launcher only takes .zips, .rars are denied. No, renaming your .rar to a .zip does not work.

Dropbox works fine. Just make the download link, manually change the 0 to a 1.

Yeah, that's Mojang's own fault. They put the original sounds/music download server offline. They "fixed" that, but that update broke forge (and due to the age of hexxit, no, that's not getting fixed). Come join the Technic Discord and we'll tell you how to get the sounds/music working.

Cause maybe. Maybe. MAybe. MAYbe. MAYBe. MAYBE. MAYBE!!!!!!!!! you shouldn't be using java 13 but java 8 instead? "Hey, this stuff probably doesn't work when used, wanna use it anyways? -> Yes "OMG IT DOESN'T WORK"".

Sigh, its gonna be a game of a thousand questions again I see...

You could probably use this. http://jenkins.liteloader.com/view/1.12.2/job/LiteLoader 1.12.2/lastSuccessfulBuild/artifact/build/libs/liteloader-1.12.2-SNAPSHOT.jar What do you need this mod for in the first place?

Use 64bit java (you are using 32bit). To install that, download the OFFLINE installer from java.com.

Which mc version?

It's because you bought the wrong version of minecraft. This launcher requires a JAVA minecraft account. Windows 10 (which, yes, is cheaper) is completely useless. In multiple ways.

What's the platform name?

Well, ofcourse that modpack isn't going to run correctly. It is a port of a Twitch modpack, ported incorrectly, and no forge was included. You'll have better luck with other modpacks.

Incorrectly zipped, but its not going to work anyways, since Forge changed their installation process.

Forge completely changed their installation process so that it only works for the vanilla client, and in extension, Twitch Client (due to that just making a profile for the vanilla client that comes with it).

No, you are trying to make a 1.13+ modpack, and Forge simply doesn't work anymore with Technic Launcher for 1.13+. ETA to be fixed: Never.

You check on mcleaks.net how to completely remove it.

Mac? Windows? Linux? Java 5? 6? 7? 8? 9? 10? 11? 12? 13? 14? (are we up to 15 yet? pls stop it Oracle). You can atleast start the modpack? -> Launcher Options -> Open Logs. Use pastebin or paste.ubuntu.com.

They probably did so by looking through my post history.

Follow the guide? https://technicpack.zendesk.com/hc/en-us/articles/204199345-How-to-make-a-Minecraft-modpack

It will be "unresponsive" until the whole modpack has started. Clicking it before that makes it worse, actually. And that's the buildcraft version check, as in, the update checker. Which doesn't work anymore for the very old TekkitMain, as it is trying to check some dropbox file that doesn't exist anymore. Buildcraft works fine...

Considering that MultiMC has a wholly different installation process, why didn't you follow the techniclauncher modpack guide?

Are you using MC-Launcher or hackphoenix?

So, did you copy this from curseforge?