A1 poster size

[Anglea]

Hi everyone,

any idea how can I change the line below to produce A1 poster size,
instead of a0 poster size.

\documentclass[portrait,a0]{a0poster}

I changed the lines above to
\documentclass[portrait,a1]{a1poster}

but a warning message apears

[LaTeX] finished with exit status 1
./12.tex:2:File `a1poster.cls' not found. \usepackage

and I could not find the package `a1poster.cls' to download

wishes,
Anglea

[Peter Flynn]

It should be  \documentclass[portrait,a1]{a0poster}

The a1 is an option, not the name of the class.

///Peter