You can get the latest ashell binary executable from
http://www.microsabio.net/dist/50rel/ For RHEL4, you'll want the bin-linux-el4 directory.
In there, you will typically find a bin file (complete installation package) and several .tz files (which generally contain only the ashell executable. You can extract contents of the tz file with:
tar xvzf filespec.tz
As for the SOSLIB, the general theory was that it was something for developers, and developers would be assumed to have Internet access, if not on the target server, then on a PC. (If you have A-Shell/Windows, you could run SOSUPD on it and then zip the entire [9??,*] directory tree up and FTP to it to your Linux box.)
But given that this is the second request for it in a week, perhaps I will go through the process myself and post a single zip sometime in the not-too-distant future.