1. Click the 3 lines in the top-left corner of MPC, then select File > Save Project As...
2. Choose an easily accessible save location for your project, such as your Desktop.
3. Go to the save location in your File Explorer and you will see x2 files: a Project File (.xpj) and a Project Data folder.
4. Import both files into an online cloud storage website such as Google Drive, then send a public link to your friend so that they may download both the project file and project data.
5. Once your friend has downloaded these files, they will need to make sure that the project file and project data are kept in the same folder on their computer with no other files.
6. Following this, your friend will simply need to open the project file, and it will automatically load all of the project data with it.
Note: the person who receives the project should make sure that they have the same plugins installed as the person sending the project.