The version 6.0.0.10 still had the "Sync Now" button on the command bar of the Compare Folder window, despite of the command Sync Folders disappeared from the Main TOOLBAR of the CloudBerry Explorer for Amazon S3 PRO. In the Version 6.3.0.18 - the only version suggested today - you can again and again click on the button "Compare", you can even choose the direction of Synchronization, but you have no means to execute Sync itself. You cannot even just Move or Copy any file in this window due to lack of appropriate buttons on the Tool Bar of Comparison window. So, you can not SYNC at all.
There is no Guide or Tutorial that would explain the meaning of buttons for each window of the GUI application. Some PDF files from HELP pages of CloudBerry are just aborted after the very first window without any attempt to explain essential modes. It is very frustrating. Browsing gigabytes of Internet and loosing a lot of time I located the version 3.4.1.13 on the SOFTONIC site.