Issue with csv export/import

I have a multi-site that is using All in One Calendar for several years on a server that is currently running PHP ver 4.2. In an attempt to build a backup of one of the child sites on my local server I find that I receive a prompt after doing an import of events (via: =>tools => import) stating: “Invalid post type ai1ec_event” for all events and the events fail to import. In addition the back end display on the multisite looks different in several ways starting with the fact that the topmost item in the left column is “events” while in the fresh local install is is “time.ly” …. any advice on this?

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