The enclosure is still being sold (but I have had it for at least two years, first used on Windows 8) e.g. http://www.pbtech.co.nz/index.php?z=p&p=ENCWEL0603
The Welland site only mentions Windows as high as Windows 7 and there are no drivers for it.
The issue is that if my HP laptop running Windows 10 is started with the enclosure attached, it seems to takes ages to start the laptop.
If the enclosure is not attached then Windows 10 starts up in seconds.
If have checked the BIOS settings and the first location for checking is the HP Internal Drive (now an SSD).
Naturally, I could start the laptop without the enclosure and then add it soon after the laptop has booted.
I prefer not to as sometimes I forget and one of the bays in the enclosure has a disk which is used (amongst other things) for FileHistory backup and a Windows 7 Weekly Backup.