General information about how to get and install MuPAD are given in Installation of MuPAD.
The usage of the slackware pkgtool is not supported with this release. Please refer to section Unix Installation to read how to install MuPAD on Linux.
MuPAD for Linux is also available on the following ftp sites. Before you try to get it, please refer to that list to find the ftp site next to you.