If you have Disk Drill PRO and have recovered items to a DMG (disk image) you may notice that you cannot launch applications from the disk image.
We have investigated this issue, but have not yet found a definitive answer. It’s likely an issue of Fuse for OS X, which is a third-party app installed with Disk Drill to help you mount disk images. Or it may have to do with the way OS X treats the mounted disk, and for some reason it cannot map the .app bundle into memory.
Regardless of the cause, there is a simple fix. Just drag the application file from the disk image to a physical drive and it should then launch correctly.