I have two computers with PL4. One is connected to the internet and the other is not. Both are set up exactly the same with the same modules and presets. I have just updated both to 4.3.1.
Now, the one that is not connected to the internet is indicating (the green down arrow) that I have to download the optics modules for my various cameras and lenses - even though the modules are already installed and show on the list.
The computer that is connected to the internet is working properly.
Nope, the shot date does not make any difference. Could you, please, also try the following:
1 - Copy CAFList4.db from %LocalAppData%\DxO\DxO PhotoLab 4\ from your PC with Internet and put it in the same location on you PC without Internet (and remove the old one before).