The installation program is trying to use the wrong compiler path for D2010. The generated error log file shows this near the top:
-------------------------------------------------Initializing setup for Delphi 2010-------------------------------------------
D2010 found
Correct Delphi / C++ Builder Environment found
Delphi 2010 selected for installation
So clearly it's finding my D2010 installation (looking in registry perhaps?)
But later uses the wrong path:
COMPILE PATH : C:\Program Files (x86)\CodeGear\RAD Studio\7.0\bin\dcc32.exe
Instead of the proper path
C:\Program Files (x86)\Embarcadero\RAD Studio\7.0\bin\dcc32.exe
This is the default installation path on an x64 machine for Delphi 2010 from Embaradero, not CodeGear.