[RetroGamer1985]

I only have a copy of 3.9.2, sorry.

if you can copy the archives in a .tar or .iso file and include it in an ftp or add it somewhere on the web.

If you are interested I have a 3.9.1 version of Softimage 3d
https://drive.google.com/drive/folders/1...sp=sharing

It's dump of my own cd

Hi, thank you very much it has worked on windows perfectly but IRIX does not start the installer because maybe only the installer works on CDROM Drive and the SGI Indy do not have, but anyway thank you very much. 

So download soft391.tar.gz archive from the same location, gunzip it, tar -xvf and run install program from irix directory. It should work. (works for me).