There is a bug in the Version 3.1 installer when installing on systems with Delphi 2006 or C++ Builder 2600 personality only. When the installer was written and tested it was tested on a system with C++ Builder and Delphi 2006 personalities present. We apologize for our mistake, and the inconvenience! Delphi 2006 There is an easy workaround the problem. Please follow the steps bellow, and you will be able to install on your Delphi 2006: You need to go to this entry in the registry: HKEY_LOCAL_MACHINE\SOFTWARE\Borland\BDS\4.0\Personalities Then add a String Value with name "BCB". There is no need to add a value! Then you can run the install. After you are finished, you can delete the entry.   C++ Builder 2006 There is an easy workaround the problem. Please follow the steps bellow, and you will be able to install on your C++ Builder 2006: You need to go to this entry in the registry: HKEY_LOCAL_MACHINE\SOFTWARE\Borland\BDS\4.0\Personalities Then add a String Value with name "Delphi.Win32". There is no need to add a value! Then you can run the install. After you are finished, you can delete the entry.   Once again we are sorry for the bug, and the inconvenience! We have fixed the bug, and the fix will be available in the next version of the libraries.