Error message 'This project cannot be opened in the Studio Edition you are using. Only project packages or single documents can be opened'.

Since this afternoon I get this message after trying to open a project that was assigned to me through GroupShare. Once downloaded, the whole project is not visible in my project list in Studio. When I try to open it from the projects on my drive, I get the above message. I'm using Studio 2022. How can I resolve this?

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