trying to use nightly in windows 10 x64

[steven kladitis via Digitalmars-d-learn]

before trying nightly
I run the c:\d\dmd2vars32.bat or c:\d\dmd2vars64.bat respectively.
and I can compile an run either 32 or 64 bit executables.
now I want to try nightly
I renamed the  current dmd directory in c:\d to dmd_current
I extracted the 7z file for nightly into c:\d
the 32 bit appears to work, but the 64 bit now complains about 
c:\bin\link.exe
I run the c:\d\dmd2vars32.bat or c:\d\dmd2vars64.bat respectively.
Why does the 64 bit no longer compile at all?


TIA,
Steven