My assumption is that you have OTS recently installed on another computer? Do you have empty categories on the "new" computer?
I have a second computer where it was just the "shell" with the basic categories (empty). I wanted a mirror image of my primary computer (Win 7); newer computer has Win 8.1.
I would suggest copying the Ots Media Library from the master computer's local drive (C), OtsLabs, Data, OtsAvDJ.oml where the OtsAvDJ.oml is current.
Copy the OtsAvDJ.oml file to a flash drive and copy it to your "new" computer's path ( Local Drive C, OtsLabs, Data, OtsAvDJ.oml). Don't delete the "new" computer's current OtsAvDJ.oml. What you have copied will be what is presently on the Master computer. Create a shortcut of the just copied OML and place it on your desktop screen.
Click on the desktop shortcut you just created. What comes up should be the same as your master computer; however, you should modify this new OML to something like OtsAvDJ.oml - Master (2-16-19) which tells you that this is now a new Master OML.
As you add more and more data to your Primary Laptop (Master) at some point you will want to update your secondary computer's OML again. Each time you plan to update your second computer, be sure to change the existing master be sure to re-name the OML, i.e. OtsAvDJ.oml - Master (2-16-19) to the current date. You will eventually have accumulated several OtsAvDJ.oml masters in both computer Ots Media Libraries. I usually keep several OML (masters) in each computer's OHML file.
For example: File Folder in Computer/local disk C/OtsLabs/Data/ OHML
OtsAVDJ.oml 6-6-17.oml
OtsAVDJ.oml - Redesign 6-26-17 [My computer crashed in June 2017, so I had to re-create contents of all categories]
OtsAVDJ.oml - Redesign (6-26-17) - (Master (11-09-17.oml)
OtsAVDJ.oml - Redesign (6-26-17) - (Master (07-05-18.oml)
...
OtsAVDJ.oml - Redesign (6-26-17) - (Master (12-16-18.oml)
OtsAVDJ.oml - Redesign (6-26-17) - (Master (12-16-18.oml) - Shortcut
I also keep several versions of the most recent OML on the Flash Drive in case something happens to either computer or both.
Need to update again this month the second computer OML this month. By the way, I have two external HD with same data files.
I hope this helps.