You don't have to downgrade, but upgrade. It was mbarcode-core that is corrected in its version mbarcode-core _1.0.2-6, and mbarcode now forces this to be installed (or any later version) after mbarcode_1.0.3-1.

The version numbers are similar, but don't follow eachother I've updated the above post to reflect that.

In short, all you should have to do is upgrade your mbarcode package in the package manager and it will take care of the rest.