Revert to prior Bitwarden version on Mac

I had downloaded and was using Bitwarden without a problem on my Mac but am now unable to open it as it appears I need OSX 10.10 or later to use it. But I had been using this program without a problem before so I would like to know if there is somewhere I can re-download the prior version that would work on Mavericks.

I had emailed Bitwarden before and had been told to check “Assets” however there is no Assets link that I was able to find and no one ever responded to my email asking about the assets page.

Any help anyone can provide me would be great. Thank you in advance for your help.

Out of curiosity: are you not able to update OSX to any more recent version?

No. I am unable to update the OSX on my computer. My computer is old. I cannot afford a new one. I am working with what I have and what I have is a computer running OSX 10.9.5.