It sounds as if you were trying to install Official TWRP App - this actually does a quite different job from Recovery.
You can simply boot into Recovery mode, to see if you have TWRP. If you find that you have /e/ Recovery, perhaps see if the process still looks intuitive with the information you have.
I tried both boot.img in the folder of the link. both did not work .
I have a Gs290 directly bought from EFoundation - could I perhaps revert to the default EOs boot.img?
DAvid