The moment you decide to update and it all goes wrong, you have to do a fresh install of domoticz and restore your backup into it. However once a new version is out, Domoticz doesn't give you a way to download the previous version. You have to compile it yourself which is to me extremely annoying and time consuming.

This is why I decided to archive the older versions just in case.

You can open these files with any compression tool, 7zip, winzip, etc. 

Windows:

Linux

ARM X86

ARM X64