I received the answer via email.
Here is the response:
"You can install Boxcryptor on a new device as normal, log in with your access data and connect OneDrive.
You will then have access to your files as usual.
You don't have to download any files, as Boxcryptor works like a virtual drive that mirrors your data from the cloud.
If you do want to download a file, it is sufficient, if it is saved in any physical location that is connected to Boxcryptor."