On the contrary, invenio has been polite all the way.
As to "files", if the directory were the intended item, that would have been explicitly mentioned as the directory (or folder) files or as /files.
The problem with the "long" topic is that it's unnecessarily long and no progress has been made, and that not due to lack of effort on the part of those trying to offer support.
My suggestion:
The database backup of the 3.3.3 you made. Zip that and upload that in somewhere (with a password) and send me (or anyone else offering) the link in a PM.
I'll have a look at it and we'll take it from there. This offer is valid for an hour from time of this post (and not a minute longer as there are other activities scheduled).