Where is the 1.05 for mac?

It was stated by the developers they dropped the Mac version with 1.05 due to the lack of resources (they're only one developer and two artists).

As Occular Malice said, there will never be 1.05 for Mac. From dev blog (https://raftsurvivalgame.wordpress.com/blogg/):

"No more Linux and Mac support!
Unfortunately, we will no longer support Mac and Linux. Since we are three people, and we do not work on Linux or Mac, we don't have the time or resources to develop to these platforms. As the game becomes more complex, more and more problems arise specifically on Mac and Linux, which means we would have to spend too much time fixing those problems. We're really sorry about this, and we hope to be able to port to these platforms in the future! We hope you understand!"

Stupid that they didn't remove the download and are seemingly just pretending it still has support, but yeah, Windows-only now. You can run Windows in Boot Camp.