Setup TMS VCL UI Pack

On my machine there is Delphi 10.3 and Delphi 10.4 running.


Yesterday I installed the latest version of TMS VCL UI Pack for both installations of Delphi. 

Loading an application for developping in Delphi 10.4, I get the message, that following components are missing:
TADVPolypage
TADVPage
TADVQuickAccesstoolbar
TADVOfficepage

Loading the same application in Delphi 10.3, the components exists.
What to do?

Verify that all (5) TMS VCL UI Pack packages are effectively installed (listed) and active (checked) under Component / Install Packages

Thank you for your answer. The package TMS VCL UI Design Time support was not active.

Now it works.