I purchased 2 USB accounts to have Directory Opus portable.
I have not received instructions on how to put Directory Opus on a jump drive.
What size jump drive is needed and how do I get Directory Opus on to the drive?
Make sure you have installed your new licence/certificate file which should have been emailed to you after adding the USB Export option.
Once that is there, instructions for the rest can be found here in the manual: Exporting to USB
Not much space is needed on the drive, at least by modern standards. About the size of the C:\Program Files\GPSoftware folder, or less, depending on which options you export.