Note:

The 1.41 version in mx54 was compiled under SunOS 5.4  *NOT COMPRESSED*
The 1.39 version in mx53.Z was compiled under SunOS 5.3
The other version in mx413.Z was compiled under SunOS 4.1.3

These are compressed binaries; select the one you need to 
grab to run mx on your SUN workstation.  To install, do the following:

uncompress mx53.Z
mv mx53 mx
chmod +x mx

For global use, it would After uncompress'ing, it 
can be run using

mx < inputfile > outputfile

See the directory ~ftp/pub/mx/examples for example files.
You may also wish to grab the text files bmx and jobdone and then

edit the file bmx - change the paths to the mx and jobdone files 
                    to agree with those on your system.  /usr/local/bin 
                    is a good place to put them
then...

chmod +x bmx

so that the command

bmx myfile

will execute the command

mx <myfile.mx > myfile.mxo &

and notify you when the job has finished.