You can't flash the zip. Use a file manager to copy the ui.zip to the /TWRP/theme folder.I download the theme img from the beginig of this post and i flashed with flashify but only the start screen was showing the new image from theme but when was in the recovery the theme was not applied.I tryit with zip also i create theme folder then i rename zip file with ui.zip but when i tryit to fla**** operation was failed.Please tell me from where to download the file and if i proceed directly.Thank you!