If you would like to ask a question about the pro version, you can email us at support at maxfoundry.com as www.ads-software.com does not allow us to discuss paid plugins on this forum.
As for moving files, note that (1) there are limitations to browser memory, thus it would be prudent to move a smaller number of files (let’s say one hundred at a time) rather than move more than the browser can handle. And (2) the media library is a database and not a live picture of the site. Every move requires the database to be updated with the new link information along with moving the file and all its thumbnail images. And also each move sets off a search and replace of embedded links in posts and pages. Thus, a lot of processes are taking place when an image is moved. And before moving lots of image, do a test move to verify the links in posts or page are updated correctly as some WordPress theme and plugins store links in a non standard format.