IMPORTANT: If you have previously downloaded Marc, please delete it and replace it with the latest version.

Unity recently notified developers of a security vulnerability that affected all games developed using certain versions of their engine (including Marc).  You can read more here. Both the windows and mac versions of Marc has been patched, so if you update everything should be a-ok!

According to Unity, no players have been affected, but it's important to  update to the latest versions of all games built in Unity.