if you downgrade to BIMcloud Basic, you must convert any existing BIMcloud Projects to a regular folder, because BIMcloud Basic does not support BIMcloud Projects. For this reason, the downgrade process will prompt you to use this command.
See Downgrade from BIMcloud to BIMcloud Basic.
On the Projects page of BIMcloud Manager:
1.Select the BIMcloud Project
2.Click the More... command, then Convert to folder.
Converting a BIMcloud Project to a folder means that its Teams and related access definitions will be lost. (Teams are relevant only to BIMcloud Projects - they have no meaning for regular folders or other items on the BIMcloud).