Hi, The installer program is on the CD amigaos3.9:OS-version3.9/workbench3.5/utilities/installer.
Just drag and drop this to your sys:c directory. Any program with an installation script wil need you to have this in your c directory.
It sounds like this PVS program requires you to have MUI installed - if you have any coverdisks (CDs) most tend to have a version of MUI included. Alternatively you can download it from
http://main.aminet.net/util/libs/mui38usr.lha however it's 1 meg so you'll either need to connect your miggy to the net, or unpack the file on your pc side and port bits of it across at a time on a crossdos disk.
As to the rest, I haven't got my mediator installed yet, so good luck on that. When you get it working please post a description to help others in the future who may have similar problems.