Import Scrivener v1 files to new V3

I had scrivener 1 , and all the files backed up to a different drive (but not scrivener itself just all the files).
I now have a new SSD and have bought and installed Scrivener 3,

How to I get Scrivener 3 to ‘see’/ import all my old files/projects please?

Just use the Open Project command to browse to the old project. Scrivener 3 will automatically convert it to the new format.