How to update the Bisq software on Mac

I recently accepted the option to instal a new version of the Bisq software on my Mac. I expected the download to contain a new version of the software in the usual .dmg package. I was surprised to find the following files had been downloaded:

  • 7 other asc.backup files with hexadecimal names!

I have no idea what use these files have and what I am supposed to do with them. I would very much appreciate your advice.

The .asc files are used to verify integrity of the download.
The last Bisq version is now v1.5.1!

You can download it from here to save doing two updates: