This morning I installed Rad Studio 11.3 Professional. Opening a project, I found Subversion integration nonfunctional, despite the path to the client (TortoiseSVN) being set.
Copying the subversion folder from an 11.0 installation into the 11.3 bin folder and setting the Tools->Options->Version Control->Subversion->Subversion Path fixed the issue, but it's a kludge which shouldn't be needed. When I installed Rad Studio 11.0 Professional last year, Subversion support was enabled by default.
Am I missing a step in the installation? Or is there now a separate component for integrated SVN support? I do notice that in 11.0, there is no 'Subversion Path" under Tools->Options->Version Control->Subversion; this seems to be new.