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. In order to run mods on your Windows or Mac computer, you'll need to install the correct version of Minecraft Forge. This program allows Minecraft to utilize installed mods. If you want to use mods for Minecraft 1.12.2, then download and install the recommended version of Forge for Minecraft 1.12.2. Go to a Minecraft mod site, find a mod that you like, and download the mod in question. A couple of notable Minecraft mod sites include the following:  http://www.minecraftmods.com/ You can also type a specific mod type (e.g., "tanks") followed by "minecraft mod" into Google and browse the results. Make sure the mod is for the same version of Minecraft as Forge or it may not work. Make sure that you don't download anything that hasn't been verified as safe by the website's community. Find the downloaded mod file in your computer's normal downloads location, then click it to select it. The mod file should resemble a Java logo on a white background. If the mod file downloads in a ZIP folder, you'll first need to extract the file before selecting it. Press Ctrl+C (Windows) or ⌘ Command+C (Mac) to copy mod file. Double-click the Minecraft app icon, which resembles a block of dirt with grass on it. The Minecraft launcher will open and update if it's out of date. As of January 2018, the latest launcher release is version 1.12.2. It's a tab in the upper-right side of the launcher window. If you don't see this tab, first click ☰ in the upper-right side of the launcher window. This is in the middle of the window. It's on the right side of the launcher window, directly across from the "Game directory" switch. Doing so opens the folder in which all of your Minecraft game folders are located. Double click the "mods" folder to open it. If you don't see the "mods" folder, create one:   Windows - Click Home, click New folder, type in mods, and press ↵ Enter.  Mac - Click File, click New Folder, type in mods, and press ⏎ Return. Click a blank space in the "mods" folder, then press Ctrl+V (Windows) or ⌘ Command+V. The mod file will appear in the folder. If the mod file does not appear, do steps 3 and 4 again and then try pasting again. You can also close the mods folder at this point. It's to the right of the giant green PLAY button. A pop-up menu will appear. This option will be the Minecraft Forge version number. Doing so will allow you to load the mods. Minecraft will load, along with mod that you added to the "mods" folder. When you start a game (existing world or new world), the mod will automatically be applied.  If you don't want to use the mod anymore, you can switch back to the Minecraft profile in the launcher by clicking the "Profile" arrow, clicking Minecraft, and clicking PLAY. Deleting a mod file from the "mods" folder will remove the mod from Minecraft.
Install Minecraft Forge Download a mod that you want to use. Select the mod file. Copy the file. Open the Minecraft launcher. Click Launch options. Click Latest release. Click the green "Game directory" arrow. Open the "mods" folder. Paste in the mod file. Close and re-open the launcher. Click the "Profile" arrow. Click the "minecraft forge" option. Click PLAY.