Fatal error: Class 'ToppaFunctions' not found

Hello,

I just upgraded to 3.5 and updated the Post to Post Links II plug-in and now I’m getting an error when I activate:

Fatal error: Class ‘ToppaFunctions’ not found in [path]\wp-content\plugins\post-to-post-links-ii\lib\Post2Post.php on line 119

I deactivated it so it doesn’t break the site. I tried uninstalling it and reinstalling it. Any ideas on where to look next?

https://www.ads-software.com/extend/plugins/post-to-post-links-ii/