Installing an update on my wp site
This need to be done manually. Download from GitHub and then upload it to WordPress. In case if you see 2 AnsPress plugins in your WP site then remove old one.
Dima Stefantsov commented
Back up your wordpress database and files before doing anything. In case something go wrong, you just revert to your backup.
Your questions and posts are stored in database and should not be affected in any way.
Will all my old posts be removed if I do this?