SFTP SCP Server - Security questions on release

Hello everyone,

I have some questions about the security of your product : Free SFTP SCP Server. What is the last version of this product ? 

I am doing some security researchs on the version  of this product, and I would like to know anything about it because I can not find any information on your website. When did you release it ? Is this version still secure or did you release some patchs / new versions because of security flaws ?