Error occurred while downloading revision content.

Since the shared folder was unshared, the account can no longer access the file data from the previous revisions, which only existed in the context of that shared folder. 

The ListRevisions method does confusingly return those old revisions though, so I'll ask the team to see if we can improve or clarify this behavior and/or documentation. 

If you use ListRevisionsMode.Path those old revisions shouldn't be returned though, like on the web site.

It is correct for me that API returns all revisions, because i get the memberAccountId of user who created the document from the last revision (property: AsFile.SharingInfo.ModifiedBy). I will lose the author if user unshare the folder and API will return only last revision.

I'm interested why i can not download the previous versions? I always was the owner of the folder and every time has full access for all revisions.

Thanks for the feedback! The previous revisions only exist within the namespace for the shared folder. When you unshare a shared folder, you essentially destroy that namespace, so its old contents are no longer accessible.

I've sent this along to the team to see if we can change this, but I can't make any promises. I'll follow up here with any updates on this.

Thank You!