Posting in short some pointers that seemed to have worked for me in installing PSL based REDUCE. I was having quite some difficulty in installing REDUCE for purposes of using DAISY (that requires a PSL version of REDUCE). Things took a while but seem to have got sorted out now. I use a Windows Vista OS. One primarily needs Cygwin and an svn package (for subversion) to install REDUCE - PSL on Windows. The standard installation of Cygwin does not build REDUCE well and one additionally needs packages.Broadly speaking, the instructions at http://reduce-algebra.com/downloading.htm are very helpful. The tentative list of packages needed along with Cygwin given at http://reduce-algebra.sourceforge.net/windows.html and pointers from Arthur Norman finally seem to have worked in getting things sorted.
Just posting this here hoping it would be of some use to people stuck similarly.