Tools like Prism Launcher or GDLauncher allow you to create "Instances." You can set the "Instance Path" to a portable drive.
Even years after its release, 1.12.2 continues to be a primary hub for modders for several reasons: fapcraft mod 1122v11jar portable
For 1.12.2, ensure your portable setup includes Java 8 . Newer versions of Java often cause compatibility issues with older Forge builds. Safety Reminder Tools like Prism Launcher or GDLauncher allow you