Find the latest version of tModPorter in the tModLoader repo: https://github.com/tModLoader/tModLoader/tree/HEAD/tModPorter

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Make a backup before using this tool, either by using git and committing your code, or by copying your mod's source code to some other place

This tool lets you port 1.3 mods to 1.4, it is not perfect, but it can port many things.

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How to use:

1. Download the tModPorter repo, open tModPorter.sln and build the solution.
2. Install tModLoader 1.4 (you can find more info about this on the tModLoader discord)
3. Open tModLoader 1.4, go to the Mod Sources menu and click the Open Sources button to open the Mod Sources folder
4. Copy your mod's source to the Mod Sources folder (i.e. copy ModLoader/Mod Sources/MyMod to tModLoader/Mod Sources/MyMod)
5. Open tModLoader again and go to the Mod Sources menu. You will see your mod with a little exclamation mark (saying Upgrade .csproj file). Click that button so that your mod can work with the 1.4 classes (and tModPorter can correctly port your mod).
6. Drag and drop your mod's .csproj file (usually named YourModName.csproj) to the tModPorter .exe file (that you either got from building tModPorter yourself, or from a release if there's one available)

If you manually built tModPorter, the exe should be in tModPorter/tModPorter.Console/bin/Debug/net6.0/tModPorter.Console.exe.

You need to install the .NET 6 SDK to build and run tModPorter.