@Alex T⚜️how can I upgrade the local installation? I tried to add a key and secret to my UNA account, and added a new site with http://localhost/ but still can't get the upgrade button on the local installation.
If in your local UNA all requirements in the Dashboard are OK, then possibly, you need to configure etc/host to make the unique site name "looking like the real one". After this action, you need to generate a new key-secret pair for it and save it in the settings. Then try to check the upgrade appearances again.