I am playing now with this old plugin. Update is not possible, there are changes in database.
I am playing now with updating one of the old plugin by Father Barry. This plugin is not listed between active plugins for version 0.7.
I needed at first to understand how this works. It's not easy to get how somebody else code works.
Now this is moved to testing part and for me it was good school how to do some things.
You can use it on your own risk, it probably never be fully finished because in this state it is enough for my personal using.