Current Version is: UltimateDefrag Version 188.8.131.52 (Release date: 12 June 2012) This common windows operation comprises Disk Management but on the matter of commercial third party Defragmentation's for HHD's. Ever since Isso first introduced this (first ever of it's kind) Disk Metaphor defragger by way of DiskTrix, it for me was a breakthrough of sorts in micro-managing the manner in which common disk platter types could be defragged to the end-user's preference. I quickly became I think it's biggest supporter and in spite of some reported small issues (aside from complaints to Boot-Time issues) It offered multiple features to accomplish file placements and not only to the program's presets but also introduced manually capability wherein you can "drag n drop" entire folders of files (or just individual files) for desired placements on your HHD to your own personal preferences for optimum efficiency. In my opinion it was "Leap" far beyond anything ever attempted before and it still WORKS! For me, it was Defrag Automation at it's absolute best and safely On-Demand without any services/process dependencies that many other present day commercial one's claim must run to be effective. Nonsense I say. Who needs yet another added process monitoring your reads/writes etc. and on-the-fly move and/or fill empty spaces while in windows active sessions. After all this time i still find this (abandonware now?) UD4 entirely up-to-task even on my Windows 8.1 and it's still proven to almost cure a rainy day for my systems. I have tried every single big boy defragger available, O&O Defrag, PerfectDisk, etc you name it. This one rules the day over any others for me and being now 2016 i'm frankly quite surprised because it's not been updated or upgraded to a new version since 4 was released back in 2012. Does anyone else still find this defragger working to near perfection for them as I have? Now mind you since I am on Windows 8.1 and UEFI/GPT that for safety sakes I absolutely avoid Boot-Time operations but AS-IS for common defrag who needs that anyway right?