ExpanDrive v5.3 is out on the auto-updater and the main download page.
NEW Preliminary support for Sharepoint Online [Office 365 Sites]
NEW Rewritten WebDAV connector
NEW All-new metadata caching layer, bringing faster access and asynchrnous updates of regularly used data
NEW Moved to OneDrive v2 API
NEW Improvements to SFTP layer for speed and large file transfers
For the curious yes, we skipped v5.2 – It was an internal release in testing for an extended period of time that we decided not to publish.