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So many people install mods for survival by replacing game files, but there actually is a bug, that allows you to load survival worlds with mods from creative mode. It is much easier and allows to install multiple mods at once.
Create World
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For the first step we need to create your survival world:
Head over into the survival mode menu and create a world.
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Moving Save File Into Creative Mode Menu
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Because there is no mod support in survival yet, we will make the game think that the save file is a creative world and let us install mods.
For that you need to exit the game first.
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Now go into file explorer and find your save file in the following address:
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- C:\Users\[USERNAME]\AppData\Roaming\Axolot Games\Scrap Mechanic\User\User_[RANDOM NUMBERS]\Save\Survival
After you have located your game file move it to the saves folder.
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Now you can restart your game and move onto your next step.
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Install Your Mods
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Now all you need to do is go into the creative mode menu, find your game and install your mods.
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When you are done choosing your mods you can load into the game.
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To get acces to your mod parts you need to enable dev mode, i won't go over it in this guide, but you can easily find how to do this on the internet.
When you have dev mode activated type /unlimited into the chat to use your mod parts.
Now you can use mod parts in your world!
Source: https://gameplay.tips/guides/9273-scrap-mechanic.html
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