I don't know about Infrraworks, but until now, the Recap file formats (RCS, RCP) have been compatible with all versions.
So if your Infraworks can insert these file types as "collaboration model" like a plain Autocad 2016 or higher, it does not matter with which version of Recap they were generated or edited.
Hi @marywinkley1386,
I'm just checking in to see if you need more help with this. Did the suggestion that @Patrick_Aps_9121 provided work for you?
If so, please click Accept as Solution on the posts that helped you so others in the community can find them easily.