This has been 1 year without updates, there are 3 active alternatives, kde control station by eliverlara, plasma control hub and plasma flex hub, these last two maintained by me

I can confirm I have an internet connection, if there's anything else that I could provide to possibly help do let me know!

I will check it, consider that an internet connection is required to set the schedules.

Doesn't seem to be work properly, always sets the wallpaper to be image 4 regardless of time

same here, never worked with the same error. It seems this widget is abandonware