We have uploaded a new version of Derpy World because lately anti-virusses have noted that our game contains a virus. This is not true of course. A tool that we used to decrease the size of files caused false positives in anti-virusses because after this process they were unable to scan the files correctly and thus automatically flagged them as suspicious. The new version of Derpy World does not use this tool anymore, so it should work just fine now. We apologize for any inconveniences this may have caused.