Hi,
Thanks for informing us. This is indeed a bug in the VCL UI Pack distribution and we will fix it as soon as possible.
In the meantime, if you want to fix it manually, you can:
Open the file "C:\Tools\tmssmartsetup\tms.vcl.uipack\packages\d12\TMSVCLUIPackGroup.groupproj" in Rad Studio
For each of the projects in the group, right click it, select "Options..." and in the dialog, select Build->Delphi Compiler-> Output - C/C++
Select "All Configurations" in the Target
Select "C++ Output File Generation..." and then "Generate All C++ Builder files":