I tried updating Views PHP using drush and got the following error:
Unable to download views_php-7.x-1.x-dev.tar.gz to /tmp/drush_tmp_1380570885_5249d70555de3 [error]
When I try to download Views PHP by clicking on the download .tag.gz link at https://drupal.org/project/views_php I get the following error:
The requested URL /files/projects/views_php-7.x-1.x-dev.tar.gz was not found on this server.
Apache Server at ftp.drupal.org Port 80
I am able to download other modules using drush, so this appears to be a Views PHP specific issue.