Install Singular 4-x-x on a Microsoft Windows Platform
1) install cygwin ( https://cygwin.com/setup-x86_64.exe) with default settings, additional,
at "Select Packages" choose wget.
2) in the cygwin terminal:
wget ftp://jim.mathematik.uni-kl.de/repo/cygwin/64/build.tartar xf build.tar; bash build_cygwin
Now Singular can be started within the cygwin terminal as Singular.
Important Note: If you want to make use of the Singular command surfer, you will additionally have to download and install surfer-setup.exe, and make sure that the newly installed surfer.exe is included in the Windows environment variable Path.