I deleted following lines about the installation of SDL Trados Studio 2011 in PackageTracking.xml before the installation of SDL Trados Studio 2014 SP2:
< Suite Id="TranslationStudio2011" Version="2.2.3046">
< Package Id="d1858c60-5e3d-44c3-81b2-1188907531d5" />
The path of file PackageTracking.xml is:
After the installation you can add the deleted lines to the PackageTracking.xml.