Problem adding the restore archive to the disk manager

[sekarb]

I was about to pull the trigger on buying the software and encountered this error...

I am on a MacBook Pro 2019 with Catalina 10.15.1

I have a bootcamp partition.
- I used the 'Create archive' button to make an image in my downloads folder [.hdmbackup extension]
- Then moved the image to a subfolder I created later.
- Then later on I opened the disk manager and it showed nothing in the archive list as I had moved it
- I clicked on the + button to add that archive. When I selected and clicked ok, I get a 'undefined error'.
- Then I moved the archive back to the same location just in case and still get that error.

Any idea what that error means? Just when I was hoping that my bootcamp backup strategy is finally working :/

thanks