Hi Goran,
Embarcadero added better support for HighDPI in the controls in version 7. Yes, you will need to uninstalled 6.5.0 from RAD Studio 10.4 before installing version 7. Unfortunately, Embarcadero does not state this anywhere in GetIt and they did not create the installer to check if version 6.5 is already installed. So, if you have 6.5 installed and try to install version 7, you’ll get some odd errors about packages already being loaded. The solution is to use the GetIt Package Manager to uninstall version 6.5 first, then install 7.0.
Hope this helps.
Ray