There are two ways of installing mods for Factorio. Firstly, you can install mods the easy way, which is done by downloading and installing them when in-game. Although this requires you to have a Factorio account and for that profile to be linked to your Steam Profile.
The other way is to do it manually. This involves downloading the mods as .ZIP files and placing them into Factorio’s mods folder, which can be found inside of your user data. We’ll guide you to the location below.
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Installing Factorio Mods to a Folder
There are a few sites you can download Factorio mods from, with the main one being the official website. When you download a mod, you’ll receive it in a .ZIP format, you don’t need to open this or extract them anywhere. Instead, you need to place the .ZIP file into your Factorio Mods folder.
To get there, head to your AppData folder. The easiest way to do this would be by opening up your Start Menu and typing %appdata% then hitting Enter. This should bring you to the following location, which you can head to manually. C:\Users\YOU\AppData\Roaming

Once in the AppData folder, head into Roaming if you aren’t already in there. Inside, look for the folder named Factorio, then go into the ‘mods’ folder. If it doesn’t exist, create it. Inside here, you should place any .ZIP files you have downloaded.
Activating Factorio Mods
Once you’ve placed the mods into the correct folder, you will probably need to active them and check they’re working. To do this, open up Factorio and head to the ‘Mods’ section from the main menu.

Under the ‘Manage’ tab, you can see a list of mods you currently have installed. You can make sure they’re enabled by ensuring all the boxes are checked on the left hand side. You can also uninstall them by pressing the trash icon in the top right corner, just make sure to Confirm your changes in the bottom right.