How do i install mods on terraria cracked ?

The Terraria.exe in your folder most likely is the original terraria.exe, if you want to crack a steam game you have to crack the steam_api.dll.
So just try replacing your terraria.exe with the modded exe

I still cant understand what you are saying but does this method work? If i take my friends steam api dll and put it in my terraria folder will it work then ?

No -.-
I'm saying to just replace your Terraria.exe with the modded one

Where can i get the modded one ?

A normal Terrariamod is a modded Terraria.exe -.-

Well i have your client but that didnt work either

Well it should work since my client is nonsteam compatible in itself
So what is the problem

Game Launcher / tConfig want work for cracked Terraria.exe. No matter which you use. You need for GL/TC the original game with a cracked steam_api.dll.

And before someone say someting else, a file md5 wont be the same if the file has noch the same file size. (There are more things which needed not to be changed) but this is the easy way for me to descripe it.~

first time seeing you here

And btw. since 1.2, gamelauncher doesn't supports any kind of tshock mods.
You can easily name the original (cracked) terraria for: terraria original.exe
infinest's client: hacky terraria.exe
terrahax client as: cheaty terraria.exe

or whatever, since, you can have multiple "XYZ terraria.exe"s at once, and you mustn't replace them either. The main point will be, they should consider their location in the "Terraria" folder, besides of the "Content" folder.

I am always renaming new/other executables from terraria/hacked terraria clients, and can choose which one to start without messing around replacing the files over and over again.

can you make a video?