If you prefer using the vanilla Minecraft launcher, you can force it into portable mode using a Windows batch file.
Launch the executable from your USB. During the initial setup wizard, select the option to keep all data local to the application folder.
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Click "Add Instance," select version 1.8.9, and hit create.
1.8.9 is incredibly lightweight. It runs smoothly on older hardware and laptops that might struggle with the technical demands of modern versions. If you prefer using the vanilla Minecraft launcher,
A portable application runs entirely from a single folder without installing files into your computer's hidden system directories (like AppData\Roaming on Windows).
Create a folder on your USB drive named MinecraftPortable . When searching for a "Minecraft download 189 portable"
Which you plan to use (Official, Prism, or another option)?