Scrivener 1.9.16.0 can not open the Project created by Scrivener 3 on mac

I have upgraded to Scrivener 3 for my mac , But I found that the Project I had created in Scrivener 3 on mac os can not be opened by the windows version (1.9.16.0), how to do? I wand the two version can be used for the same Project at diffent computer .

You either have to save the project in the old format from the Mac, or download the beta version of the coming Win Scriv 3 on the PC.

thankyou my issue has been solved