I have two PCs both with XE2. I thought that I had installed identically on both but have problems installing 3rd party packages on one while the other is just fine.
The tool for this is now built into Delphi XE8 and higher.
It's found here: C:\Program Files (x86)\Embarcadero\Studio\20.0\bin\migrationtool.exe
C:\Program Files (x86)\Embarcadero\Studio\20.0\bin\migrationtool.exe
Online documentation:
http://docwiki.embarcadero.com/RADStudio/Rio/en/Settings_Migration_Tool