Hey, so I recently downloaded this mod pack to allow me to have a backpack and it came up with a loading error saying that "File TravellersBackpack- 1.12.2 - 1.0.20.20.Jar is for an older version of Forge and cannot be loaded."
I will download an older version of Forge but it may also be worth to upgrade it to the version of Forge that is out at this moment, just a suggestion.
Also as it would be easier on new players of Minecraft Mods to access the mod pack without needing to downgrade their Forge.