Instructions:

1) Move iagproc.cls to a directory that LaTeX sees
(for me, e.g., /usr/share/texmf/tex/latex/base/) and run there 
(as root) the program texthash.

2) Move iagproc.layout to a LyX layouts directory.  For me,
on system level that is /usr/share/lyx/layouts/, or on user 
level $HOME/.lyx/layouts.

3) Reconfigure LyX.

4) Re-start LyX. Now you should find "article (IAG Proceedings)"
under the document layout menu.


