You need to delete the previous version, and then download v1.10 from your iniBuilds Store account and install the new version.
In order to update the addon, it is required to completely reinstall it. Not to forget, numerous bugs have been fixed in this update. In addition, custom weather radar has been implemented to the aircraft being compatible with Active Sky XP and aircraft systems. It is important to keep in mind, that the passenger variant of the aircraft does not bring only visual enhancements, but modified ground equipment or aircraft systems such as the one used for air conditioning as well.
The update is massive, first, it consists of numerous bug fixes, it also brings massive performance improvements, around 20/30% more FPS on short flights up to 50% more on long ones, compatibility with macOS, and last but not least, the free passenger variant is available with this update.
The announcement was made through the iniBuilds Forums. Just yesterday we reported that iniBuilds published the changelog of v1.10 of their A300-600R(F) ON THE LINE, the update has been rolled out today, December 7th, at 1 pm CEST.