Which version of OS and version is the SAP ASE Developer Edition?

Unless I'm missing something, I could not determine which OS and version the file I am about to download will run on. I contacted SAP to clarify and I was told to post my question here.

It's remarkable to me that the person I chatted with could not answer some basic question and directed me to this forum. At the very least OS and version should be listed on the download webpage. Additionally, what version of Sybase will I be downloading 16 or 15.7.

Thanks in advance for your assistance.

Rob