At each time (session) on quixel.com !!! Yes that the trick!
Sign Out - Sign in with Epic Game Launcher (first top choice ...so no need Mail / Password for Quixel...it's the Epic Launcher who makes that)
and you have not the screen that you show and then choice Menu Products / Browse Megascans
then download all that you want! :)
And of course maybe texturize any Moi Object! ;)
You can choice FBX or OBJ, size image 2K to 8K etc...
for example here the asset 3D with only its texture in Simlab :)
You can also download these 2 free things ! Bridge (for export to third party) and Mixer for make texture "with zero learning curve! :)