Any installation of Disk Drill can be portable as long as you don’t install Recovery Vault. Get diskdrill.dmg again, run it, copy Disk Drill to your USB drive instead of Applications folder. Run the app from USB, you will see the welcome screen with some ‘simple’ questions. Click that ‘simple’ label, you will get a bit more details from this dialog. Basically, you just need to disable the first option that keeps your files protected. That’s it. We’ll have a more detailed article on portable mode shortly.