Is a free of charge viewer for Smap3D P&ID diagrams available?

YES, there is a viewer "free of charge" for Smap3D P&ID projects and diagrams available.

This you can download with the following link:

Download Smap3D P&ID viewer english

This viewer with name PCschematic viewer and the version number 13.0 is compatible to the Smap3D P&ID versions 9.5 and 9.6.

It can installed and used as often you like.

This viewer can open, view and print all ".PRO" files of the versions listed above.