It is a third party script - unsupported by Manjaro.
I suggest you talk to the creator.
→ [root tip] [How To] Do a manual Manjaro installation
→ [root tip] [How To] Manjaro-To-Go LXDE with persistance
→ [root tip] [Utility Script] Encrypted Manjaro Linux using Verified Boot
→ Mapare - manjaro package restore
→ [HowTo] portable manjaro USB with XFCE, btrfs (part1)