Problem with a templates in After Effect

Hello everyone,

I recently download the template for After Effect name “Smartphone screen | Promo app” with my Mac. But when I open it in After Effect it say : “This project have to be convert from the version 9.0 (Windows). The original file will remain unchanged.”
And when I click in the “ok” button I can’t see a lot of file of the templates, numerous files are not found !

I don’t know what to do. I want to succeed in reading all the files of the templates, it is quite urgent for my work.

If you can help me, I will be really grateful if you answer at this message !

Thank you in advance.