Ok! I'll try it tomorrow. In my country its 9:47 PMMaybe you need to delete and rename few words in ROM? Remember,you need make a backup before this operations!
1.Copy the zip file of the ROM to your computer and extract it using archiver.
2.After unpacking, find the META-INF folder and follow the META-INF / com / google / android chain. In the last folder you will find two files called "update-binary" and "updater-script".
3.Rename "updater-script" to "updater-script.txt" and open your text file editor (Notepad ++ for example)
4.Get rid of lines starting with "assert" before semicolons. This is usually the first or the first few lines at the top of the text file. Just remove them.
5.Save the file.
6.Rename "updater-script.txt" back to "updater-script".
7.Update any files you unpacked.
8.Copy the new,edited zip on SD card.
9.Wipe data,cache,system and reboot recovery.
If it doesn't help,you need to delete files CERT.RSA, CERT.SF, MANIFEST.MF. You will find it in META-INF.
You need download ROM again,if nothing can help you.Maybe your previous downloaded file is destroyed.
I don't recommend old TWRP versions,this can give you an error.