When installing python 3.6.0rc1 it errors saying that it cannot find python.dll  in cab1.cab (or some sort of file name similar to that) which it would obviously not exist. and then when I try to uninstall it it will fail saying 3.6 is not installed but not check the registry to remove the entries for the windows Installed programs list.

I would like if the (web and non web) installers would actually get better and check right before closing if 3.6 is in the registry when it cant find one installed and remove those entries. As well as looking for previous python versions that lo longer are on disk but are on the registry as if they are installed (basically allows for proper cleanup).