Mailspring 1.14 don´t work on High Sierrra Mac

I have a mac version 10.13.6 High Sierra. My version of Mailspring is 1.13.1
It automatically updates to version 1.14, which I cannot open on my Mac because it is old. How can I prevent it from updating automatically? Where can I find older versions of Mailspring?
Thank you

You find old version of Mailspring on GitHub.

Thanks. I’ve done that. The problem is that with version 1.13 it updates automatically every time I close it, and I have to reinstall it every day. Is there a way to disable the automatic update? I didn’t find one.
Thanks for everything.