Very Annoying!!

I download a wallpaper, then downloaded a few more, but each time I start my computer the first wallpaper I downloaded is still there. This is very annoying, particularly because I do not like that wallpaper any more. I have contaced the company who makes this app, but so far no response. I have uninstalled the app many times, using unistall software. I have even trashed all the folders I can find that might be causing this issue, but nothing has worked.

lfrom1 about Wallpapers HD Lite, v1.4