I'm using File Manager 3.8 build257.

How to find the newest version (build)?

I can see only FileManager3.8 in Premium files.

Your current version should be fine unless you run into any problems.

The latest version is FileManager 3.8 Build 260. We will release a new 4.0 version FileManager very soon.

To find your current version and build number, please click on Top-left corner and select About DriveHQ FileManager.