0.4.1 has never existed for the NXi.
There’s the G1000 mod, placed in the Community folder, which had versions 0.4.0 and 0.4.1 (the latter is still the most recent).
Then there’s the G1000 NXi replacement (written from scratch), in the Marketplace, which has had versions 0.1.0, 0.2.0, 0.3.0 and 0.5.0.
If you used the G1000 0.4.1 previously you can still go back to it by uninstalling the G1000 NXi from the marketplace and installing the G1000 0.4.1 in your Community folder.