Replay file from 2014

Hi, 

Client wants to update/re-brand a Replay file that I created for them back in 2014. Replay 360 asks me if I want to make a backup/upgrade, then tells me that it may have been created in an earlier version (!), may be corrupt, invalid, and stops.

Looks like it is identical to thread https://community.articulate.com/discussions/articulate-replay/converting-replay-1-files-to-replay-360

Is there anything that I can do here to get the file to work?

I still DO have the constituent elements, however it would be good to get it to work, and any ideas would be helpful.

Thanks

Bruce