There are additional sites you can find PPM-installable modules. One that I use is Randy Kobes' site at http://theoryx5.uwinnipeg.ca/   He has some of the modules you need already created in a form ActivePerl's PPM utility understands.

Packages available from http://theoryx5.uwinnipeg.ca/cgi-bin/ppmserver
+?urn:/PPMServer:
Net-SSH-Perl    [1.23] Perl client Interface to SSH
Net-SSH-W32Perl [0.05] Win32 (ActivePerl) Compatibility Layer for
                       Net::SSH::Perl
Packages available from http://ppm.ActiveState.com/cgibin/PPM/ppmserve
+r.pl?urn:/PPMServer:
Net-SSH [0.07] Perl extension for secure shell
[download]

Depending on the ActivePerl version you have you would set PPM to use one of Randy's two PPM-package directories. I use the 6xx one, which you can add to PPM using:

      set repository RK http://theoryx5.uwinnipeg.ca/cgi-bin/ppmserver
+?urn:/PPMServer
[download]

I'm not sure the exact setting to use if you have a newer 8xx version of ActivePerl.

You then do a search on, say, SSH and the above listing should appear. You may then do a normal "install Net-SSH-Perl". Having done this Net-SFTP (0.05) _will_ install, but the "make test" output looks skinnny. You'll have to tell us if it works. ;-o