Hunting Failed due to the backend issue

[jaamelines]

I follow the procedure of "ADH-User-Guide" which says that in "Browse" look for 4 .arch.H files that are in "sample images" and then press "START HUNTING", but I get the following error: " Hunting Failed due to the backend issue. ", I see that I have to open some .fits files, but I do not know where to download them.
My email is [email protected]