Disable anspress users to answer a closed question

Hello,

Thank you for your reply.

I tried to upload your plugin 2.0 from here https://github.com/wp3/anspress/archive/Reborn.zip bur it caused a code error to disable uploading.
Fatal error: Call to undefined method anspress::instance() in /home/snowyk5/public_html/caselaw/wp-content/plugins/anspress-Reborn/anspress.php on line 258

Yes, I want to add this feature with 1.4.3 could you help me out please.