You can't install tads on retail. TwlNmenu won't install due to tads being devsigned (resigning to retail won't work btw) so you've gotta decrypt the the tads to srl with a script like this.
From there you can use NTM to install, but not all dev apps will detect as being installable by any tools other than TwlNmenu.
@Rolfie @IS1982