The newest add-on builds have no Enable Upscaling option, and now the app says so
The DLSS 5 add-on's Enable Upscaling (WIP) option runs NR upscaling that follows the game's DLSS quality preset. It exists only in the 4.x builds (4.55 and 4.70). From 5.2.1 on (6.4.1, 6.5.3, 7.0.0-rc1), the add-on replaced it with a pre-SR path and the option is gone.
This app installs 4.70 by default, so the option is there. But the "Try the newest add-on build" tick is remembered per game from what is in its folder. A game that once got a 5.x build kept losing the option on every Install, with nothing saying why (#109). The tick and the README now say it. To get the option back, untick it and press Install.
Everything from v0.13.24 is included.