Hi Daniel, thanks for your feedback!
I’m painfully aware that the REX development kit, including Showcase, does need an update. All of our development efforts have been focused on the EyeX recently and so the REX hasn’t received the care and affection that it should. But the good news is that we are working on it right now, and I hope there will be a new version available for download soon.
Btw, did you check out the EyeX SDK yet? Please have a look at this page for more info.