Software to configure RAID on WDH2Q20000

I have an old Mybook Studio Edition 2 configured as RAID 1. I would like to reconfigure this, but I cannot seem to find any suitable for this. I did not create a backup of the original software that came with the drive. Can someone tell me where I can find this (if still available)? Also, I was wondering, there are 2 1TB drives in there, can I replace them with, for example, 2 4TB drives?



Please refer to the following KBA article:

Thank you for your reply.
My Mybook is not a World Edition, so the KBA article does not really apply.
In the meantime I found this: which is exactly what I have. The software I can download there seems to work with the drive.