you need to include the version your looking for, we dont know all software, or when they change their branding from free to shareware.
a version number on a program is findable, but knowing when they changed is something one needs to know from experience with the app. and i never used the app so i can only help find an app based on a number your seeking.
Since you used the app, i am guessing, then when do you believe they changed over? thats a better clue then me guessing or downloading and installing every version i can locate
why not download a free ad blocker, i got that list up there for people to see, free is good too. older ad blockers might not be able to handle todays ads.
did you search the forum for old requests of this app? the name sound familiar. maybe someone posted links for it before, its worth your time to check the forum, just search for the keyword.