A: No. AGS is updated whenever you install a new Adrenalin driver (e.g., moving from 23.10.2 to 23.11.1). Do not manually swap DLLs across driver versions unless you know what you are doing.
If you're looking to download and install AGS driver extensions specifically for DX11: ags driver extensions dx11 init download install
A: Partially. AMD dropped official support for Windows 7 in 2022. You need to install the legacy AGS package from the AMD Radeon Software Adrenalin 22.6.1 driver (last Windows 7 version). ags driver extensions dx11 init download install
If only one game is complaining about the missing extension: ags driver extensions dx11 init download install