[Dovecot] can't download attachment from the wiki

Hi. At http://wiki.dovecot.org/ManageSieve#line-229 , I want to download the patch that's supposed to fix two problems in Avelsieve. Unfortunately, when I click on the link to the patch, I always get an error message:

You are not allowed to do AttachFile on this page.

Annoying. I've created an account and logged in, but still no joy. Can anyone suggest how or where else I can get that patch?

Thanks, Andrew.