I suppose you won’t be able to open that project. It seems like the component inside the project is corrupted. You can try this solution to open your project: Loading Project: Invalid or corrupted input data - #2 by OndrejTrhan.
The thing is, if this will happen for you again. Have you also installed the RealityCapture directly?
As I wrote it depends on your needs. But you will need to simplify that model anyway, so I suppose it is not necessary to have such big model.