As an advice in general. If I finish a project, I always archive the installation file of the Isadora version, with the actual project, I coded with it. Just in case, I need to reactivate it and have issues with newer Izzi versions.
I even keep the older version for a while in parallel in the same computer. On macOS, this is simple, as you can easily rename the applications name (adding the versions # e.g.). And install the second version.