Change the thumbnail on the steam workshop

I would like to change the thumbnail on a dupe in the steam workshop.
But when I do the command, a error message ask me if I am the author. :cry:

Can you help me ?

Are you the only author of the addon? Sometimes, the authenticator fails if there is a contributer present as well.

Thanks for reply.

No, I am the only author.
But I have publish that dupe on the game, maybe the program consider the owner is the game only ?

:snip: didn’t notice you said it was a dupe

Thanks you MPan1 for the workshopper_v1_0.exe program. It work ! I can now change de thumbnail.

Thanks you again ! <3