Trying to buy extension

I´m trying to buy the " Eneroth Scene Tag Visibility" extension by @ene_su . As I often develop the tag structure along with the project, it’s a very handy tool in order to control scene /tag visibility, so I dont have to go through every scene and update after I add a tag. I´m guessing it should work with SU 23 although that is not stated.

the purchase is through very old (?) forms of the kind where you have to choose a state in the USA although you are from a European country, in order to be able to go through with the form, and ( I usually go with Alabama) afterwards I get this:

so no response, and no sell.