Kindly search the site, it has been answered many times.
You can achieve this by hacking core, check here: Vote method, edit this method and just update post meta vote count if user is not logged in.
Try development version of AnsPress from Github.
I will check.
It was a bug of category extension, but it has been fixed yesterday. Download from here: https://github.com/anspress/categories-for-anspress
No, anonymous voting is not possible yet.