attach invoice plugin questions

When it was just available I bought the attach invoice (PDF) plugin.

First of all I don't see it in my subscriptions so can't download again and I was wondering if anything changed on it.
I have reported some bugs (like middle name missing) so I would assume there could be updates.
Can't find any release notes, version info etc.
The plugin itself does not have a version numbering either.

Please enlighten me.

There is no subscription on plugins so that's normal that you don't see it there and the download of the plugin is limited to 1 month after the order to avoid abuses. I encourage you to keep a copy of it on your end. And if you need it again, please using our contact form to request it and specify your order number.

We don't have a changelog for it either nor change the version number sicne it's not meant to be updated much once created and that the bugs get fixed.

Thanks but that leaves the most important question unanswered. How and when do I know if I need to pay/get a new version.
My one is from may 2013. Would be good to make a plugin corner on the forum for it?

There is no need to update the plugin if you don't have any problem with it. We won't add anything to it and as far as I know there are no more bugs in it.