Let's assume someone release AGPL-licensed extension (AGPL v3 or later) for DNN Platform. If I (or any other person) install the extension on a website and do some modifications (e.g. in .ascx, .cshtml, .js or .css files) - would that spread AGPL terms over entire install?

It think the AGPL will certainly apply over entire product if I would try to release my own DNN Platform package with modified AGPL-licensed extension included.

But can this modified AGPL extension be just used along with other extensions on the same install? Would that require publishing other extensions or maybe platform source under AGPL?