When downloading and installing an offline installer, I only have once the chance to see the components tree. It is impossible to get to it via MaintenanceTool/PackageManager afterwards. When trying, I get an error message.

So, I cannot remove install components or add new ones after the first install.

Reason is that the repository entries are missing.

The online installer adds repository entries, so that adding/removing of components works, there.

This is a regression. Offline Installers in previous SDKs (in Qt 4 times) offered the possibility of adding/removing components.