I installed it for Delphi 2007 and it does install files into the directory I told it to use, but it doesn't install anything in the IDE itself.
That's why I tried to recompile the thing as mentioned in the readme file by opening the WPTools5_D11_W32.dpk file.
I set the path to the D2007 directory, and it doesn't compile.
My Delphi 2007 IDE version is 11.0.2902.10471
So this means I can't install it?
Anyway, when releasing a version, you should definitely clean all references to files local to your environment.
For now I'm porting my apps to Delphi 2007 and want to make sure that all my VCL components work fine in the IDE. So I don't plan to move to the PRO version yet.