Install mods Find the mod on the web you want to install and download the file to your computer. Find the mod on the web you want to install and download the file to your computer. Go to Application Support > minecraft in Finder and create a new folder called mods. Open Finder on your Mac and go to Go > Library in the menu. Step 7: Highlight all the files in the folder. class files onto Springy or into te folder. Step 4: Right click te minecraft.jar and open it with Springy or folder Step 5: Drag the. Step 2: Go to Finder/Library/Application Support/minecraft/bin Step 3: Open up the mod file. minecraft folder) or you can download the mods directly to your mods folder. You can either move the mods manually (via the classic Cut-and-Paste or Copy-Paste method) to your mods folder (within the. In order for you to install your new mods, make sure they’re in your Minecraft Mods folder.