Note that you can even do this to play with multiple sets of mods as each game directory will have its own mods folder (for separate versions you can create a sub-folder named after the version, e.g. You should also edit the profile to use its own game directory, which is highly recommended to not just separate modded profiles but separate modded saves from vanilla and vice-versa, including different versions (this goes for vanilla as well accidentally opening a world in the wrong version, especially downgrading from 1.13, will ruin it). You should be able to install multiple versions you only need launch 1.12.2 at least once and then run the installer for 1.12.2, which will create a new profile for that version (which is just a normal profile that points to the Forge jar in the same way a vanilla profile points to a vanilla jar).
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