You need smartmontools-6.6-r4424.zip, but here it list (smartclt --scan) the disks on my other computer as you can see in the images.
You've noticed the problem with the Attribute tab, as it empty it and then add more columns with data, instead it should remove all and rebuild it from scratch every time, so now you have to scroll further and further to the right every time it load data.
The tabs for Log, Report and Summary should be filled in once the test finish (not implemented).
You can see that the right click menu has been prepared (though grayed out for now as it's not implemented).
vx-rexx is available not only as a demo if you look around the internet.