Write Permissions

Hello, I clicked the forum a bit to try to find a solution to no avail.
I am working with another author on a project using Scrivener, and so far things have been okay, but when I tried to open the project file he sent me I received this message:

Cannot Access:…

File Is not writeable: Access is denied.
Auto-Saves need write to your project.

What can we do to correct this? We both paid for our own copies of it, and we just need to share the file.

Never mind. I figured it out